631913671 has 4 divisors (see below), whose sum is σ = 638170344. Its totient is φ = 625657000.

The previous prime is 631913663. The next prime is 631913687. The reversal of 631913671 is 176319136.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 631913671 - 2³ = 631913663 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 631913671.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (631913621) 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, 3128185 + ... + 3128386.

It is an arithmetic number, because the mean of its divisors is an integer number (159542586).

Almost surely, 2^631913671 is an apocalyptic number.

631913671 is a deficient number, since it is larger than the sum of its proper divisors (6256673).

631913671 is a wasteful number, since it uses less digits than its factorization.

631913671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6256672.

The product of its digits is 20412, while the sum is 37.

The square root of 631913671 is about 25137.8931296957. The cubic root of 631913671 is about 858.1290093682.

The spelling of 631913671 in words is "six hundred thirty-one million, nine hundred thirteen thousand, six hundred seventy-one".