717631387 has 16 divisors (see below), whose sum is σ = 872553600. Its totient is φ = 581696640.

The previous prime is 717631381. The next prime is 717631393. The reversal of 717631387 is 783136717.

It is an interprime number because it is at equal distance from previous prime (717631381) and next prime (717631393).

It is a cyclic number.

It is not a de Polignac number, because 717631387 - 2²⁷ = 583413659 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (717631381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 97437 + ... + 104542.

It is an arithmetic number, because the mean of its divisors is an integer number (54534600).

Almost surely, 2^717631387 is an apocalyptic number.

717631387 is a deficient number, since it is larger than the sum of its proper divisors (154922213).

717631387 is a wasteful number, since it uses less digits than its factorization.

717631387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 202026.

The product of its digits is 148176, while the sum is 43.

The square root of 717631387 is about 26788.6428734268. The cubic root of 717631387 is about 895.2970257240.

The spelling of 717631387 in words is "seven hundred seventeen million, six hundred thirty-one thousand, three hundred eighty-seven".