90638501 has 2 divisors, whose sum is σ = 90638502. Its totient is φ = 90638500.

The previous prime is 90638491. The next prime is 90638521. The reversal of 90638501 is 10583609.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51825601 + 38812900 = 7199^2 + 6230^2 .

It is an emirp because it is prime and its reverse (10583609) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 90638501 - 2⁶ = 90638437 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90638521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45319250 + 45319251.

It is an arithmetic number, because the mean of its divisors is an integer number (45319251).

Almost surely, 2^90638501 is an apocalyptic number.

It is an amenable number.

90638501 is a deficient number, since it is larger than the sum of its proper divisors (1).

90638501 is an equidigital number, since it uses as much as digits as its factorization.

90638501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6480, while the sum is 32.

The square root of 90638501 is about 9520.4254631818. The cubic root of 90638501 is about 449.1977492145.

The spelling of 90638501 in words is "ninety million, six hundred thirty-eight thousand, five hundred one".