631691090 has 16 divisors (see below), whose sum is σ = 1186481088. Its totient is φ = 241690416.

The previous prime is 631691089. The next prime is 631691149. The reversal of 631691090 is 90196136.

It is a self number, because there is not a number n which added to its sum of digits gives 631691090.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1373012 + ... + 1373471.

It is an arithmetic number, because the mean of its divisors is an integer number (74155068).

Almost surely, 2^631691090 is an apocalyptic number.

631691090 is a deficient number, since it is larger than the sum of its proper divisors (554789998).

631691090 is a wasteful number, since it uses less digits than its factorization.

631691090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2746513.

The product of its (nonzero) digits is 8748, while the sum is 35.

The square root of 631691090 is about 25133.4655389980. The cubic root of 631691090 is about 858.0282436824.

The spelling of 631691090 in words is "six hundred thirty-one million, six hundred ninety-one thousand, ninety".