631161356 has 18 divisors (see below), whose sum is σ = 1284864588. Its totient is φ = 270497640.

The previous prime is 631161347. The next prime is 631161367. The reversal of 631161356 is 653161136.

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 5 ways as a sum of consecutive naturals, for example, 1609910 + ... + 1610301.

It is an arithmetic number, because the mean of its divisors is an integer number (71381366).

Almost surely, 2^631161356 is an apocalyptic number.

It is an amenable number.

631161356 is an abundant number, since it is smaller than the sum of its proper divisors (653703232).

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

631161356 is a wasteful number, since it uses less digits than its factorization.

631161356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3220229 (or 3220220 counting only the distinct ones).

The product of its digits is 9720, while the sum is 32.

The square root of 631161356 is about 25122.9249093333. The cubic root of 631161356 is about 857.7883300839.

The spelling of 631161356 in words is "six hundred thirty-one million, one hundred sixty-one thousand, three hundred fifty-six".