89989992731 has 2 divisors, whose sum is σ = 89989992732. Its totient is φ = 89989992730.

The previous prime is 89989992691. The next prime is 89989992737. The reversal of 89989992731 is 13729998998.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 89989992731 - 2¹⁴ = 89989976347 is a prime.

It is a super-2 number, since 2×89989992731² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (89989992737) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 44994996365 + 44994996366.

It is an arithmetic number, because the mean of its divisors is an integer number (44994996366).

Almost surely, 2^89989992731 is an apocalyptic number.

89989992731 is a deficient number, since it is larger than the sum of its proper divisors (1).

89989992731 is an equidigital number, since it uses as much as digits as its factorization.

89989992731 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 158723712, while the sum is 74.

The spelling of 89989992731 in words is "eighty-nine billion, nine hundred eighty-nine million, nine hundred ninety-two thousand, seven hundred thirty-one".