90900637 has 2 divisors, whose sum is σ = 90900638. Its totient is φ = 90900636.

The previous prime is 90900629. The next prime is 90900697. The reversal of 90900637 is 73600909.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 90897156 + 3481 = 9534^2 + 59^2 .

It is a cyclic number.

It is not a de Polignac number, because 90900637 - 2³ = 90900629 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90900697) 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, 45450318 + 45450319.

It is an arithmetic number, because the mean of its divisors is an integer number (45450319).

Almost surely, 2^90900637 is an apocalyptic number.

It is an amenable number.

90900637 is a deficient number, since it is larger than the sum of its proper divisors (1).

90900637 is an equidigital number, since it uses as much as digits as its factorization.

90900637 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 90900637 is about 9534.1825554161. The cubic root of 90900637 is about 449.6303746660.

The spelling of 90900637 in words is "ninety million, nine hundred thousand, six hundred thirty-seven".