631657613 has 8 divisors (see below), whose sum is σ = 657770880. Its totient is φ = 605833200.

The previous prime is 631657597. The next prime is 631657651. The reversal of 631657613 is 316756136.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 631657613 - 2⁴ = 631657597 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (631657513) 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, 67745 + ... + 76502.

It is an arithmetic number, because the mean of its divisors is an integer number (82221360).

Almost surely, 2^631657613 is an apocalyptic number.

It is an amenable number.

631657613 is a deficient number, since it is larger than the sum of its proper divisors (26113267).

631657613 is a wasteful number, since it uses less digits than its factorization.

631657613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144427.

The product of its digits is 68040, while the sum is 38.

The square root of 631657613 is about 25132.7995456137. The cubic root of 631657613 is about 858.0130861055.

The spelling of 631657613 in words is "six hundred thirty-one million, six hundred fifty-seven thousand, six hundred thirteen".