631287812 has 6 divisors (see below), whose sum is σ = 1104753678. Its totient is φ = 315643904.

The previous prime is 631287803. The next prime is 631287827. The reversal of 631287812 is 218782136.

It can be written as a sum of positive squares in only one way, i.e., 602407936 + 28879876 = 24544^2 + 5374^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78910973 + ... + 78910980.

It is an arithmetic number, because the mean of its divisors is an integer number (184125613).

Almost surely, 2^631287812 is an apocalyptic number.

It is an amenable number.

631287812 is a deficient number, since it is larger than the sum of its proper divisors (473465866).

631287812 is a wasteful number, since it uses less digits than its factorization.

631287812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157821957 (or 157821955 counting only the distinct ones).

The product of its digits is 32256, while the sum is 38.

The square root of 631287812 is about 25125.4415284588. The cubic root of 631287812 is about 857.8456135009.

The spelling of 631287812 in words is "six hundred thirty-one million, two hundred eighty-seven thousand, eight hundred twelve".