89921631 has 4 divisors (see below), whose sum is σ = 119895512. Its totient is φ = 59947752.

The previous prime is 89921609. The next prime is 89921633. The reversal of 89921631 is 13612998.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 89921631 - 2⁶ = 89921567 is a prime.

It is a super-2 number, since 2×89921631² = 16171799443400322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 89921631.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (89921633) 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, 14986936 + ... + 14986941.

It is an arithmetic number, because the mean of its divisors is an integer number (29973878).

Almost surely, 2^89921631 is an apocalyptic number.

89921631 is a deficient number, since it is larger than the sum of its proper divisors (29973881).

89921631 is a wasteful number, since it uses less digits than its factorization.

89921631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29973880.

The product of its digits is 23328, while the sum is 39.

The square root of 89921631 is about 9482.7016719920. The cubic root of 89921631 is about 448.0103616199.

The spelling of 89921631 in words is "eighty-nine million, nine hundred twenty-one thousand, six hundred thirty-one".