131657641 has 4 divisors (see below), whose sum is σ = 132961284. Its totient is φ = 130354000.

The previous prime is 131657609. The next prime is 131657653. The reversal of 131657641 is 146756131.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 123654400 + 8003241 = 11120^2 + 2829^2 .

It is a cyclic number.

It is not a de Polignac number, because 131657641 - 2⁵ = 131657609 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 131657597 and 131657606.

It is not an unprimeable number, because it can be changed into a prime (131654641) 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, 651670 + ... + 651871.

It is an arithmetic number, because the mean of its divisors is an integer number (33240321).

Almost surely, 2^131657641 is an apocalyptic number.

It is an amenable number.

131657641 is a deficient number, since it is larger than the sum of its proper divisors (1303643).

131657641 is a wasteful number, since it uses less digits than its factorization.

131657641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1303642.

The product of its digits is 15120, while the sum is 34.

The square root of 131657641 is about 11474.2163566842. The cubic root of 131657641 is about 508.7237614223.

The spelling of 131657641 in words is "one hundred thirty-one million, six hundred fifty-seven thousand, six hundred forty-one".