131815657 has 2 divisors, whose sum is σ = 131815658. Its totient is φ = 131815656.

The previous prime is 131815639. The next prime is 131815667. The reversal of 131815657 is 756518131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 70913241 + 60902416 = 8421^2 + 7804^2 .

It is a cyclic number.

It is not a de Polignac number, because 131815657 - 2¹¹ = 131813609 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (131815667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65907828 + 65907829.

It is an arithmetic number, because the mean of its divisors is an integer number (65907829).

Almost surely, 2^131815657 is an apocalyptic number.

It is an amenable number.

131815657 is a deficient number, since it is larger than the sum of its proper divisors (1).

131815657 is an equidigital number, since it uses as much as digits as its factorization.

131815657 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25200, while the sum is 37.

The square root of 131815657 is about 11481.0999908545. The cubic root of 131815657 is about 508.9272041156.

The spelling of 131815657 in words is "one hundred thirty-one million, eight hundred fifteen thousand, six hundred fifty-seven".