131861657 has 4 divisors (see below), whose sum is σ = 131992080. Its totient is φ = 131731236.

The previous prime is 131861651. The next prime is 131861659. The reversal of 131861657 is 756168131.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 756168131 = 59 ⋅12816409.

It is a cyclic number.

It is not a de Polignac number, because 131861657 - 2⁴ = 131861641 is a prime.

It is a super-3 number, since 3×131861657³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 131861657.

It is not an unprimeable number, because it can be changed into a prime (131861651) 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, 63683 + ... + 65720.

It is an arithmetic number, because the mean of its divisors is an integer number (32998020).

Almost surely, 2^131861657 is an apocalyptic number.

It is an amenable number.

131861657 is a deficient number, since it is larger than the sum of its proper divisors (130423).

131861657 is a wasteful number, since it uses less digits than its factorization.

131861657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130422.

The product of its digits is 30240, while the sum is 38.

The square root of 131861657 is about 11483.1031084807. The cubic root of 131861657 is about 508.9863977128.

The spelling of 131861657 in words is "one hundred thirty-one million, eight hundred sixty-one thousand, six hundred fifty-seven".