90337021 has 2 divisors, whose sum is σ = 90337022. Its totient is φ = 90337020.

The previous prime is 90337019. The next prime is 90337033. The reversal of 90337021 is 12073309.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 69305625 + 21031396 = 8325^2 + 4586^2 .

It is a cyclic number.

It is not a de Polignac number, because 90337021 - 2¹ = 90337019 is a prime.

Together with 90337019, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90337921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45168510 + 45168511.

It is an arithmetic number, because the mean of its divisors is an integer number (45168511).

Almost surely, 2^90337021 is an apocalyptic number.

It is an amenable number.

90337021 is a deficient number, since it is larger than the sum of its proper divisors (1).

90337021 is an equidigital number, since it uses as much as digits as its factorization.

90337021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1134, while the sum is 25.

The square root of 90337021 is about 9504.5789491171. The cubic root of 90337021 is about 448.6991584303.

The spelling of 90337021 in words is "ninety million, three hundred thirty-seven thousand, twenty-one".