90472169 has 2 divisors, whose sum is σ = 90472170. Its totient is φ = 90472168.

The previous prime is 90472163. The next prime is 90472183. The reversal of 90472169 is 96127409.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 89965225 + 506944 = 9485^2 + 712^2 .

It is a cyclic number.

It is not a de Polignac number, because 90472169 - 2¹² = 90468073 is a prime.

It is a super-2 number, since 2×90472169² = 16370426727129122, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (90472163) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45236084 + 45236085.

It is an arithmetic number, because the mean of its divisors is an integer number (45236085).

Almost surely, 2^90472169 is an apocalyptic number.

It is an amenable number.

90472169 is a deficient number, since it is larger than the sum of its proper divisors (1).

90472169 is an equidigital number, since it uses as much as digits as its factorization.

90472169 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27216, while the sum is 38.

The square root of 90472169 is about 9511.6859178591. The cubic root of 90472169 is about 448.9228045719.

The spelling of 90472169 in words is "ninety million, four hundred seventy-two thousand, one hundred sixty-nine".