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131165 = 537709
BaseRepresentation
bin100000000001011101
320122220222
4200001131
513144130
62451125
71054256
oct400135
9218828
10131165
118a601
1263aa5
1347918
1435b2d
1528ce5
hex2005d

131165 has 8 divisors (see below), whose sum is σ = 161880. Its totient is φ = 101952.

The previous prime is 131149. The next prime is 131171. The reversal of 131165 is 561131.

It can be written as a sum of positive squares in 4 ways, for example, as 14884 + 116281 = 122^2 + 341^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 131165 - 24 = 131149 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 170 + ... + 539.

It is an arithmetic number, because the mean of its divisors is an integer number (20235).

2131165 is an apocalyptic number.

It is an amenable number.

131165 is a deficient number, since it is larger than the sum of its proper divisors (30715).

131165 is an equidigital number, since it uses as much as digits as its factorization.

131165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 751.

The product of its digits is 90, while the sum is 17.

The square root of 131165 is about 362.1670885103. The cubic root of 131165 is about 50.8088448443.

Adding to 131165 its reverse (561131), we get a palindrome (692296).

The spelling of 131165 in words is "one hundred thirty-one thousand, one hundred sixty-five".

Divisors: 1 5 37 185 709 3545 26233 131165