631281916 has 24 divisors (see below), whose sum is σ = 1174415760. Its totient is φ = 296064000.

The previous prime is 631281913. The next prime is 631281919. The reversal of 631281916 is 619182136.

It is an interprime number because it is at equal distance from previous prime (631281913) and next prime (631281919).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (631281913) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33445 + ... + 48796.

It is an arithmetic number, because the mean of its divisors is an integer number (48933990).

Almost surely, 2^631281916 is an apocalyptic number.

It is an amenable number.

631281916 is a deficient number, since it is larger than the sum of its proper divisors (543133844).

631281916 is a wasteful number, since it uses less digits than its factorization.

631281916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82365 (or 82363 counting only the distinct ones).

The product of its digits is 15552, while the sum is 37.

The square root of 631281916 is about 25125.3241969134. The cubic root of 631281916 is about 857.8429428366.

The spelling of 631281916 in words is "six hundred thirty-one million, two hundred eighty-one thousand, nine hundred sixteen".