90168831 has 12 divisors (see below), whose sum is σ = 130484952. Its totient is φ = 60001296.

The previous prime is 90168823. The next prime is 90168853. The reversal of 90168831 is 13886109.

It is not a de Polignac number, because 90168831 - 2³ = 90168823 is a prime.

It is a super-2 number, since 2×90168831² = 16260836167813122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90164831) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3981 + ... + 14006.

It is an arithmetic number, because the mean of its divisors is an integer number (10873746).

Almost surely, 2^90168831 is an apocalyptic number.

90168831 is a deficient number, since it is larger than the sum of its proper divisors (40316121).

90168831 is a wasteful number, since it uses less digits than its factorization.

90168831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18550 (or 18547 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 36.

The square root of 90168831 is about 9495.7269863871. The cubic root of 90168831 is about 448.4205218539.

It can be divided in two parts, 90 and 168831, that added together give a square (168921 = 411²).

The spelling of 90168831 in words is "ninety million, one hundred sixty-eight thousand, eight hundred thirty-one".