631549816 has 16 divisors (see below), whose sum is σ = 1246480200. Its totient is φ = 299155104.

The previous prime is 631549811. The next prime is 631549817. The reversal of 631549816 is 618945136.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (631549811) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2077315 + ... + 2077618.

Almost surely, 2^631549816 is an apocalyptic number.

It is an amenable number.

631549816 is a deficient number, since it is larger than the sum of its proper divisors (614930384).

631549816 is a wasteful number, since it uses less digits than its factorization.

631549816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4154958 (or 4154954 counting only the distinct ones).

The product of its digits is 155520, while the sum is 43.

The square root of 631549816 is about 25130.6549059112. The cubic root of 631549816 is about 857.9642745886.

The spelling of 631549816 in words is "six hundred thirty-one million, five hundred forty-nine thousand, eight hundred sixteen".