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131690071 = 496726513
BaseRepresentation
bin1111101100101…
…10111001010111
3100011210112211001
413312112321113
5232203040241
621022324131
73156230032
oct766267127
9304715731
10131690071
1168376777
1238129647
132138ab26
14136c0019
15b864431
hex7d96e57

131690071 has 4 divisors (see below), whose sum is σ = 131721552. Its totient is φ = 131658592.

The previous prime is 131690003. The next prime is 131690081. The reversal of 131690071 is 170096131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 170096131 = 271627661.

It is a cyclic number.

It is not a de Polignac number, because 131690071 - 221 = 129592919 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131690081) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8290 + ... + 18223.

It is an arithmetic number, because the mean of its divisors is an integer number (32930388).

Almost surely, 2131690071 is an apocalyptic number.

131690071 is a deficient number, since it is larger than the sum of its proper divisors (31481).

131690071 is an equidigital number, since it uses as much as digits as its factorization.

131690071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31480.

The product of its (nonzero) digits is 1134, while the sum is 28.

The square root of 131690071 is about 11475.6294380744. The cubic root of 131690071 is about 508.7655277212.

The spelling of 131690071 in words is "one hundred thirty-one million, six hundred ninety thousand, seventy-one".

Divisors: 1 4967 26513 131690071