90915531 has 24 divisors (see below), whose sum is σ = 144023040. Its totient is φ = 50842512.

The previous prime is 90915509. The next prime is 90915553. The reversal of 90915531 is 13551909.

It is an interprime number because it is at equal distance from previous prime (90915509) and next prime (90915553).

It is not a de Polignac number, because 90915531 - 2⁵ = 90915499 is a prime.

It is a super-2 number, since 2×90915531² = 16531267554023922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 90915492 and 90915501.

It is not an unprimeable number, because it can be changed into a prime (90915131) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 330 + ... + 13488.

It is an arithmetic number, because the mean of its divisors is an integer number (6000960).

Almost surely, 2^90915531 is an apocalyptic number.

90915531 is a deficient number, since it is larger than the sum of its proper divisors (53107509).

90915531 is a wasteful number, since it uses less digits than its factorization.

90915531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13223 (or 13216 counting only the distinct ones).

The product of its (nonzero) digits is 6075, while the sum is 33.

The square root of 90915531 is about 9534.9636076914. The cubic root of 90915531 is about 449.6549305228.

The spelling of 90915531 in words is "ninety million, nine hundred fifteen thousand, five hundred thirty-one".