90940169 has 2 divisors, whose sum is σ = 90940170. Its totient is φ = 90940168.

The previous prime is 90940163. The next prime is 90940177. The reversal of 90940169 is 96104909.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 88134544 + 2805625 = 9388^2 + 1675^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90940169 is a prime.

It is a super-2 number, since 2×90940169² = 16540228675497122, 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 (90940163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45470084 + 45470085.

It is an arithmetic number, because the mean of its divisors is an integer number (45470085).

Almost surely, 2^90940169 is an apocalyptic number.

It is an amenable number.

90940169 is a deficient number, since it is larger than the sum of its proper divisors (1).

90940169 is an equidigital number, since it uses as much as digits as its factorization.

90940169 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17496, while the sum is 38.

The square root of 90940169 is about 9536.2555020301. The cubic root of 90940169 is about 449.6955455034.

The spelling of 90940169 in words is "ninety million, nine hundred forty thousand, one hundred sixty-nine".