631590990 has 32 divisors (see below), whose sum is σ = 1534087296. Its totient is φ = 166394400.

The previous prime is 631590979. The next prime is 631591001. The reversal of 631590990 is 99095136.

It is an interprime number because it is at equal distance from previous prime (631590979) and next prime (631591001).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 124336 + ... + 129315.

It is an arithmetic number, because the mean of its divisors is an integer number (47940228).

Almost surely, 2^631590990 is an apocalyptic number.

631590990 is an abundant number, since it is smaller than the sum of its proper divisors (902496306).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

631590990 is a wasteful number, since it uses less digits than its factorization.

631590990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 253744.

The product of its (nonzero) digits is 65610, while the sum is 42.

The square root of 631590990 is about 25131.4740912665. The cubic root of 631590990 is about 857.9829192268.

The spelling of 631590990 in words is "six hundred thirty-one million, five hundred ninety thousand, nine hundred ninety".