90234491731 has 2 divisors, whose sum is σ = 90234491732. Its totient is φ = 90234491730.

The previous prime is 90234491723. The next prime is 90234491773. The reversal of 90234491731 is 13719443209.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 90234491731 - 2³ = 90234491723 is a prime.

It is a super-2 number, since 2×90234491731² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (90234492731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45117245865 + 45117245866.

It is an arithmetic number, because the mean of its divisors is an integer number (45117245866).

Almost surely, 2^90234491731 is an apocalyptic number.

90234491731 is a deficient number, since it is larger than the sum of its proper divisors (1).

90234491731 is an equidigital number, since it uses as much as digits as its factorization.

90234491731 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 163296, while the sum is 43.

The spelling of 90234491731 in words is "ninety billion, two hundred thirty-four million, four hundred ninety-one thousand, seven hundred thirty-one".