90901931 has 2 divisors, whose sum is σ = 90901932. Its totient is φ = 90901930.

The previous prime is 90901883. The next prime is 90901963. The reversal of 90901931 is 13910909.

It is an a-pointer prime, because the next prime (90901963) can be obtained adding 90901931 to its sum of digits (32).

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 90901931 - 2¹⁰ = 90900907 is a prime.

It is a super-2 number, since 2×90901931² = 16526322119057522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (90901981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45450965 + 45450966.

It is an arithmetic number, because the mean of its divisors is an integer number (45450966).

Almost surely, 2^90901931 is an apocalyptic number.

90901931 is a deficient number, since it is larger than the sum of its proper divisors (1).

90901931 is an equidigital number, since it uses as much as digits as its factorization.

90901931 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2187, while the sum is 32.

The square root of 90901931 is about 9534.2504162624. The cubic root of 90901931 is about 449.6325082005.

The spelling of 90901931 in words is "ninety million, nine hundred one thousand, nine hundred thirty-one".