631497290 has 32 divisors (see below), whose sum is σ = 1151656704. Its totient is φ = 249296320.

The previous prime is 631497287. The next prime is 631497341. The reversal of 631497290 is 92794136.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 256847 + ... + 259293.

It is an arithmetic number, because the mean of its divisors is an integer number (35989272).

Almost surely, 2^631497290 is an apocalyptic number.

631497290 is a deficient number, since it is larger than the sum of its proper divisors (520159414).

631497290 is a wasteful number, since it uses less digits than its factorization.

631497290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2782.

The product of its (nonzero) digits is 81648, while the sum is 41.

The square root of 631497290 is about 25129.6098258608. The cubic root of 631497290 is about 857.9404882988.

The spelling of 631497290 in words is "six hundred thirty-one million, four hundred ninety-seven thousand, two hundred ninety".