89791631 has 2 divisors, whose sum is σ = 89791632. Its totient is φ = 89791630.

The previous prime is 89791621. The next prime is 89791633. The reversal of 89791631 is 13619798.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 89791631 - 2⁶ = 89791567 is a prime.

It is a super-2 number, since 2×89791631² = 16125073995280322, which contains 22 as substring.

Together with 89791633, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (89791633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 44895815 + 44895816.

It is an arithmetic number, because the mean of its divisors is an integer number (44895816).

Almost surely, 2^89791631 is an apocalyptic number.

89791631 is a deficient number, since it is larger than the sum of its proper divisors (1).

89791631 is an equidigital number, since it uses as much as digits as its factorization.

89791631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 81648, while the sum is 44.

The square root of 89791631 is about 9475.8446061552. The cubic root of 89791631 is about 447.7943608072.

The spelling of 89791631 in words is "eighty-nine million, seven hundred ninety-one thousand, six hundred thirty-one".