131555507 has 4 divisors (see below), whose sum is σ = 132362760. Its totient is φ = 130748256.

The previous prime is 131555477. The next prime is 131555509. The reversal of 131555507 is 705555131.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 131555507 - 2⁶ = 131555443 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131555509) 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, 403382 + ... + 403707.

It is an arithmetic number, because the mean of its divisors is an integer number (33090690).

Almost surely, 2^131555507 is an apocalyptic number.

131555507 is a deficient number, since it is larger than the sum of its proper divisors (807253).

131555507 is an equidigital number, since it uses as much as digits as its factorization.

131555507 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 807252.

The product of its (nonzero) digits is 13125, while the sum is 32.

The square root of 131555507 is about 11469.7649060476. The cubic root of 131555507 is about 508.5921791518.

The spelling of 131555507 in words is "one hundred thirty-one million, five hundred fifty-five thousand, five hundred seven".