89311531 has 4 divisors (see below), whose sum is σ = 89954200. Its totient is φ = 88668864.

The previous prime is 89311501. The next prime is 89311549. The reversal of 89311531 is 13511398.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13511398 = 2 ⋅6755699.

It is a cyclic number.

It is not a de Polignac number, because 89311531 - 2²⁵ = 55757099 is a prime.

It is a super-2 number, since 2×89311531² = 15953099139127922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 89311493 and 89311502.

It is not an unprimeable number, because it can be changed into a prime (89311501) 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, 321126 + ... + 321403.

It is an arithmetic number, because the mean of its divisors is an integer number (22488550).

Almost surely, 2^89311531 is an apocalyptic number.

89311531 is a deficient number, since it is larger than the sum of its proper divisors (642669).

89311531 is a wasteful number, since it uses less digits than its factorization.

89311531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 642668.

The product of its digits is 3240, while the sum is 31.

The square root of 89311531 is about 9450.4778186079. The cubic root of 89311531 is about 446.9948416810.

The spelling of 89311531 in words is "eighty-nine million, three hundred eleven thousand, five hundred thirty-one".