90869631 has 4 divisors (see below), whose sum is σ = 121159512. Its totient is φ = 60579752.

The previous prime is 90869627. The next prime is 90869633. The reversal of 90869631 is 13696809.

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 90869631 - 2² = 90869627 is a prime.

It is a super-2 number, since 2×90869631² = 16514579676152322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90869633) 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, 15144936 + ... + 15144941.

It is an arithmetic number, because the mean of its divisors is an integer number (30289878).

Almost surely, 2^90869631 is an apocalyptic number.

90869631 is a deficient number, since it is larger than the sum of its proper divisors (30289881).

90869631 is a wasteful number, since it uses less digits than its factorization.

90869631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30289880.

The product of its (nonzero) digits is 69984, while the sum is 42.

The square root of 90869631 is about 9532.5563727680. The cubic root of 90869631 is about 449.5792462205.

The spelling of 90869631 in words is "ninety million, eight hundred sixty-nine thousand, six hundred thirty-one".