90564169 has 2 divisors, whose sum is σ = 90564170. Its totient is φ = 90564168.

The previous prime is 90564163. The next prime is 90564181. The reversal of 90564169 is 96146509.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 89775625 + 788544 = 9475^2 + 888^2 .

It is a cyclic number.

It is not a de Polignac number, because 90564169 - 2³ = 90564161 is a prime.

It is a super-2 number, since 2×90564169² = 16403737413321122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (90564161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45282084 + 45282085.

It is an arithmetic number, because the mean of its divisors is an integer number (45282085).

Almost surely, 2^90564169 is an apocalyptic number.

It is an amenable number.

90564169 is a deficient number, since it is larger than the sum of its proper divisors (1).

90564169 is an equidigital number, since it uses as much as digits as its factorization.

90564169 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 58320, while the sum is 40.

The square root of 90564169 is about 9516.5208453510. The cubic root of 90564169 is about 449.0749209886.

It can be divided in two parts, 9056 and 4169, that added together give a square (13225 = 115²).

The spelling of 90564169 in words is "ninety million, five hundred sixty-four thousand, one hundred sixty-nine".