90131507 has 4 divisors (see below), whose sum is σ = 93239520. Its totient is φ = 87023496.

The previous prime is 90131479. The next prime is 90131513. The reversal of 90131507 is 70513109.

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 90131507 - 2¹⁸ = 89869363 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90131207) 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, 1553963 + ... + 1554020.

It is an arithmetic number, because the mean of its divisors is an integer number (23309880).

Almost surely, 2^90131507 is an apocalyptic number.

90131507 is a deficient number, since it is larger than the sum of its proper divisors (3108013).

90131507 is a wasteful number, since it uses less digits than its factorization.

90131507 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3108012.

The product of its (nonzero) digits is 945, while the sum is 26.

The square root of 90131507 is about 9493.7614779391. The cubic root of 90131507 is about 448.3586410568.

The spelling of 90131507 in words is "ninety million, one hundred thirty-one thousand, five hundred seven".