3931631616 has 416 divisors, whose sum is σ = 12738643200. Its totient is φ = 1064304640.

The previous prime is 3931631609. The next prime is 3931631653. The reversal of 3931631616 is 6161361393.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 66637795 + ... + 66637853.

Almost surely, 2^3931631616 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3931631616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6369321600).

3931631616 is an abundant number, since it is smaller than the sum of its proper divisors (8807011584).

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

3931631616 is a wasteful number, since it uses less digits than its factorization.

3931631616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143 (or 121 counting only the distinct ones).

The product of its digits is 52488, while the sum is 39.

The square root of 3931631616 is about 62702.7241513477. The cubic root of 3931631616 is about 1578.3050263251.

The spelling of 3931631616 in words is "three billion, nine hundred thirty-one million, six hundred thirty-one thousand, six hundred sixteen".