90585631 has 2 divisors, whose sum is σ = 90585632. Its totient is φ = 90585630.

The previous prime is 90585629. The next prime is 90585637. The reversal of 90585631 is 13658509.

It is a weak prime.

It is an emirp because it is prime and its reverse (13658509) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 90585631 - 2¹ = 90585629 is a prime.

It is a super-2 number, since 2×90585631² = 16411513087336322, which contains 22 as substring.

Together with 90585629, 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 (90585637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45292815 + 45292816.

It is an arithmetic number, because the mean of its divisors is an integer number (45292816).

Almost surely, 2^90585631 is an apocalyptic number.

90585631 is a deficient number, since it is larger than the sum of its proper divisors (1).

90585631 is an equidigital number, since it uses as much as digits as its factorization.

90585631 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32400, while the sum is 37.

The square root of 90585631 is about 9517.6483965316. The cubic root of 90585631 is about 449.1103922823.

The spelling of 90585631 in words is "ninety million, five hundred eighty-five thousand, six hundred thirty-one".