131581507 has 2 divisors, whose sum is σ = 131581508. Its totient is φ = 131581506.

The previous prime is 131581481. The next prime is 131581511. The reversal of 131581507 is 705185131.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 131581507 - 2⁷ = 131581379 is a prime.

It is not a weakly prime, because it can be changed into another prime (131581907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65790753 + 65790754.

It is an arithmetic number, because the mean of its divisors is an integer number (65790754).

Almost surely, 2^131581507 is an apocalyptic number.

131581507 is a deficient number, since it is larger than the sum of its proper divisors (1).

131581507 is an equidigital number, since it uses as much as digits as its factorization.

131581507 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4200, while the sum is 31.

The square root of 131581507 is about 11470.8982647393. The cubic root of 131581507 is about 508.6256821852.

The spelling of 131581507 in words is "one hundred thirty-one million, five hundred eighty-one thousand, five hundred seven".