131431507 has 2 divisors, whose sum is σ = 131431508. Its totient is φ = 131431506.

The previous prime is 131431481. The next prime is 131431513. The reversal of 131431507 is 705134131.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-131431507 is a prime.

It is not a weakly prime, because it can be changed into another prime (131431207) 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, 65715753 + 65715754.

It is an arithmetic number, because the mean of its divisors is an integer number (65715754).

Almost surely, 2^131431507 is an apocalyptic number.

131431507 is a deficient number, since it is larger than the sum of its proper divisors (1).

131431507 is an equidigital number, since it uses as much as digits as its factorization.

131431507 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1260, while the sum is 25.

The square root of 131431507 is about 11464.3581154812. The cubic root of 131431507 is about 508.4323346965.

Adding to 131431507 its reverse (705134131), we get a palindrome (836565638).

The spelling of 131431507 in words is "one hundred thirty-one million, four hundred thirty-one thousand, five hundred seven".