131565631 has 2 divisors, whose sum is σ = 131565632. Its totient is φ = 131565630.

The previous prime is 131565611. The next prime is 131565647. The reversal of 131565631 is 136565131.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 131565631 - 2¹¹ = 131563583 is a prime.

It is a super-2 number, since 2×131565631² = 34619030520856322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 131565593 and 131565602.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131565611) 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, 65782815 + 65782816.

It is an arithmetic number, because the mean of its divisors is an integer number (65782816).

Almost surely, 2^131565631 is an apocalyptic number.

131565631 is a deficient number, since it is larger than the sum of its proper divisors (1).

131565631 is an equidigital number, since it uses as much as digits as its factorization.

131565631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8100, while the sum is 31.

The square root of 131565631 is about 11470.2062317990. The cubic root of 131565631 is about 508.6052252423.

The spelling of 131565631 in words is "one hundred thirty-one million, five hundred sixty-five thousand, six hundred thirty-one".