631309390 has 32 divisors (see below), whose sum is σ = 1225355040. Its totient is φ = 233395200.

The previous prime is 631309387. The next prime is 631309423. The reversal of 631309390 is 93903136.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32731 + ... + 48310.

It is an arithmetic number, because the mean of its divisors is an integer number (38292345).

Almost surely, 2^631309390 is an apocalyptic number.

631309390 is a deficient number, since it is larger than the sum of its proper divisors (594045650).

631309390 is a wasteful number, since it uses less digits than its factorization.

631309390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81108.

The product of its (nonzero) digits is 13122, while the sum is 34.

The square root of 631309390 is about 25125.8709301787. The cubic root of 631309390 is about 857.8553873745.

The spelling of 631309390 in words is "six hundred thirty-one million, three hundred nine thousand, three hundred ninety".