89218931 has 2 divisors, whose sum is σ = 89218932. Its totient is φ = 89218930.

The previous prime is 89218919. The next prime is 89218963. The reversal of 89218931 is 13981298.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 89218931 - 2¹⁸ = 88956787 is a prime.

It is a super-2 number, since 2×89218931² = 15920035297565522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (89218901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 44609465 + 44609466.

It is an arithmetic number, because the mean of its divisors is an integer number (44609466).

Almost surely, 2^89218931 is an apocalyptic number.

89218931 is a deficient number, since it is larger than the sum of its proper divisors (1).

89218931 is an equidigital number, since it uses as much as digits as its factorization.

89218931 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31104, while the sum is 41.

The square root of 89218931 is about 9445.5773248648. The cubic root of 89218931 is about 446.8403038314.

The spelling of 89218931 in words is "eighty-nine million, two hundred eighteen thousand, nine hundred thirty-one".