89991431 has 4 divisors (see below), whose sum is σ = 90019272. Its totient is φ = 89963592.

The previous prime is 89991401. The next prime is 89991449. The reversal of 89991431 is 13419998.

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 89991431 - 2²⁶ = 22882567 is a prime.

It is a super-2 number, since 2×89991431² = 16196915306855522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (89991401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8321 + ... + 15786.

It is an arithmetic number, because the mean of its divisors is an integer number (22504818).

Almost surely, 2^89991431 is an apocalyptic number.

89991431 is a deficient number, since it is larger than the sum of its proper divisors (27841).

89991431 is a wasteful number, since it uses less digits than its factorization.

89991431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27840.

The product of its digits is 69984, while the sum is 44.

The square root of 89991431 is about 9486.3813438002. The cubic root of 89991431 is about 448.1262515535.

The spelling of 89991431 in words is "eighty-nine million, nine hundred ninety-one thousand, four hundred thirty-one".