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131705437 = 617213461
BaseRepresentation
bin1111101100110…
…10101001011101
3100011211022220011
413312122221131
5232204033222
621022523221
73156322603
oct766325135
9304738804
10131705437
1168387276
1238136511
1321394b16
14136c5873
15b868c77
hex7d9aa5d

131705437 has 4 divisors (see below), whose sum is σ = 131919516. Its totient is φ = 131491360.

The previous prime is 131705423. The next prime is 131705461. The reversal of 131705437 is 734507131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 734507131 = 6710962793.

It can be written as a sum of positive squares in 2 ways, for example, as 29877156 + 101828281 = 5466^2 + 10091^2 .

It is a cyclic number.

It is not a de Polignac number, because 131705437 - 27 = 131705309 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 131705399 and 131705408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131705417) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 106114 + ... + 107347.

It is an arithmetic number, because the mean of its divisors is an integer number (32979879).

Almost surely, 2131705437 is an apocalyptic number.

It is an amenable number.

131705437 is a deficient number, since it is larger than the sum of its proper divisors (214079).

131705437 is an equidigital number, since it uses as much as digits as its factorization.

131705437 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214078.

The product of its (nonzero) digits is 8820, while the sum is 31.

The square root of 131705437 is about 11476.2989243048. The cubic root of 131705437 is about 508.7853150572.

The spelling of 131705437 in words is "one hundred thirty-one million, seven hundred five thousand, four hundred thirty-seven".

Divisors: 1 617 213461 131705437