90337921 has 2 divisors, whose sum is σ = 90337922. Its totient is φ = 90337920.

The previous prime is 90337873. The next prime is 90337927. The reversal of 90337921 is 12973309.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 85655025 + 4682896 = 9255^2 + 2164^2 .

It is an emirp because it is prime and its reverse (12973309) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 90337921 - 2⁹ = 90337409 is a prime.

It is not a weakly prime, because it can be changed into another prime (90337927) 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, 45168960 + 45168961.

It is an arithmetic number, because the mean of its divisors is an integer number (45168961).

Almost surely, 2^90337921 is an apocalyptic number.

It is an amenable number.

90337921 is a deficient number, since it is larger than the sum of its proper divisors (1).

90337921 is an equidigital number, since it uses as much as digits as its factorization.

90337921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10206, while the sum is 34.

The square root of 90337921 is about 9504.6262945999. The cubic root of 90337921 is about 448.7006485093.

The spelling of 90337921 in words is "ninety million, three hundred thirty-seven thousand, nine hundred twenty-one".