90631 has 2 divisors, whose sum is σ = 90632. Its totient is φ = 90630.

The previous prime is 90619. The next prime is 90641. The reversal of 90631 is 13609.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 90631 - 2⁵ = 90599 is a prime.

It is a super-3 number, since 3×90631³ = 2233323164128773, which contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 90599 and 90608.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45315 + 45316.

It is an arithmetic number, because the mean of its divisors is an integer number (45316).

2⁹⁰⁶³¹ is an apocalyptic number.

90631 is a deficient number, since it is larger than the sum of its proper divisors (1).

90631 is an equidigital number, since it uses as much as digits as its factorization.

90631 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 162, while the sum is 19.

The square root of 90631 is about 301.0498297624. The cubic root of 90631 is about 44.9185357404.

The spelling of 90631 in words is "ninety thousand, six hundred thirty-one".