90900631 has 4 divisors (see below), whose sum is σ = 91616512. Its totient is φ = 90184752.

The previous prime is 90900629. The next prime is 90900637. The reversal of 90900631 is 13600909.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 90900631 - 2¹ = 90900629 is a prime.

It is a super-2 number, since 2×90900631² = 16525849432396322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 90900631.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90900637) 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 in 3 ways as a sum of consecutive naturals, for example, 357750 + ... + 358003.

It is an arithmetic number, because the mean of its divisors is an integer number (22904128).

Almost surely, 2^90900631 is an apocalyptic number.

90900631 is a deficient number, since it is larger than the sum of its proper divisors (715881).

90900631 is a wasteful number, since it uses less digits than its factorization.

90900631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 715880.

The product of its (nonzero) digits is 1458, while the sum is 28.

The square root of 90900631 is about 9534.1822407588. The cubic root of 90900631 is about 449.6303647732.

The spelling of 90900631 in words is "ninety million, nine hundred thousand, six hundred thirty-one".