90316921 has 2 divisors, whose sum is σ = 90316922. Its totient is φ = 90316920.

The previous prime is 90316879. The next prime is 90316943. The reversal of 90316921 is 12961309.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 77792400 + 12524521 = 8820^2 + 3539^2 .

It is a cyclic number.

It is not a de Polignac number, because 90316921 - 2¹⁵ = 90284153 is a prime.

It is not a weakly prime, because it can be changed into another prime (90316951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45158460 + 45158461.

It is an arithmetic number, because the mean of its divisors is an integer number (45158461).

Almost surely, 2^90316921 is an apocalyptic number.

It is an amenable number.

90316921 is a deficient number, since it is larger than the sum of its proper divisors (1).

90316921 is an equidigital number, since it uses as much as digits as its factorization.

90316921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2916, while the sum is 31.

The square root of 90316921 is about 9503.5215052106. The cubic root of 90316921 is about 448.6658774197.

The spelling of 90316921 in words is "ninety million, three hundred sixteen thousand, nine hundred twenty-one".