717120631 has 8 divisors (see below), whose sum is σ = 728936064. Its totient is φ = 705338040.

The previous prime is 717120601. The next prime is 717120637. The reversal of 717120631 is 136021717.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-717120631 is a prime.

It is a super-2 number, since 2×717120631² = 1028523998811676322, which contains 22 as substring.

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 717120631.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (717120637) 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, 37926 + ... + 53596.

It is an arithmetic number, because the mean of its divisors is an integer number (91117008).

Almost surely, 2^717120631 is an apocalyptic number.

717120631 is a deficient number, since it is larger than the sum of its proper divisors (11815433).

717120631 is a wasteful number, since it uses less digits than its factorization.

717120631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16421.

The product of its (nonzero) digits is 1764, while the sum is 28.

The square root of 717120631 is about 26779.1081068806. The cubic root of 717120631 is about 895.0845736377.

The spelling of 717120631 in words is "seven hundred seventeen million, one hundred twenty thousand, six hundred thirty-one".