90369817 has 2 divisors, whose sum is σ = 90369818. Its totient is φ = 90369816.

The previous prime is 90369809. The next prime is 90369821. The reversal of 90369817 is 71896309.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 77951241 + 12418576 = 8829^2 + 3524^2 .

It is a cyclic number.

It is not a de Polignac number, because 90369817 - 2³ = 90369809 is a prime.

It is a super-2 number, since 2×90369817² = 16333407649226978, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (90369827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45184908 + 45184909.

It is an arithmetic number, because the mean of its divisors is an integer number (45184909).

Almost surely, 2^90369817 is an apocalyptic number.

It is an amenable number.

90369817 is a deficient number, since it is larger than the sum of its proper divisors (1).

90369817 is an equidigital number, since it uses as much as digits as its factorization.

90369817 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 81648, while the sum is 43.

The square root of 90369817 is about 9506.3040662499. The cubic root of 90369817 is about 448.7534505209.

The spelling of 90369817 in words is "ninety million, three hundred sixty-nine thousand, eight hundred seventeen".