131491479657 has 16 divisors (see below), whose sum is σ = 185829888960. Its totient is φ = 82417853952.

The previous prime is 131491479617. The next prime is 131491479661. The reversal of 131491479657 is 756974194131.

It is a happy number.

It is not a de Polignac number, because 131491479657 - 2²⁸ = 131223044201 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 131491479597 and 131491479606.

It is not an unprimeable number, because it can be changed into a prime (131491479617) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1304107 + ... + 1401312.

It is an arithmetic number, because the mean of its divisors is an integer number (11614368060).

Almost surely, 2^131491479657 is an apocalyptic number.

131491479657 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

131491479657 is a deficient number, since it is larger than the sum of its proper divisors (54338409303).

131491479657 is a wasteful number, since it uses less digits than its factorization.

131491479657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2706392.

The product of its digits is 5715360, while the sum is 57.

The spelling of 131491479657 in words is "one hundred thirty-one billion, four hundred ninety-one million, four hundred seventy-nine thousand, six hundred fifty-seven".