131251562657 has 4 divisors (see below), whose sum is σ = 131294360496. Its totient is φ = 131208764820.

The previous prime is 131251562653. The next prime is 131251562699. The reversal of 131251562657 is 756265152131.

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: 756265152131 = 71 ⋅10651621861.

It is a cyclic number.

It is not a de Polignac number, because 131251562657 - 2² = 131251562653 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131251562653) 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, 21394319 + ... + 21400452.

It is an arithmetic number, because the mean of its divisors is an integer number (32823590124).

Almost surely, 2^131251562657 is an apocalyptic number.

It is an amenable number.

131251562657 is a deficient number, since it is larger than the sum of its proper divisors (42797839).

131251562657 is an equidigital number, since it uses as much as digits as its factorization.

131251562657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42797838.

The product of its digits is 378000, while the sum is 44.

The spelling of 131251562657 in words is "one hundred thirty-one billion, two hundred fifty-one million, five hundred sixty-two thousand, six hundred fifty-seven".