717052621 has 4 divisors (see below), whose sum is σ = 728807644. Its totient is φ = 705297600.

The previous prime is 717052613. The next prime is 717052667. The reversal of 717052621 is 126250717.

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

It can be written as a sum of positive squares in 2 ways, for example, as 390852900 + 326199721 = 19770^2 + 18061^2 .

It is a cyclic number.

It is not a de Polignac number, because 717052621 - 2³ = 717052613 is a prime.

It is a super-2 number, since 2×717052621² = 1028328922565939282, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (717052601) 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, 5877420 + ... + 5877541.

It is an arithmetic number, because the mean of its divisors is an integer number (182201911).

Almost surely, 2^717052621 is an apocalyptic number.

It is an amenable number.

717052621 is a deficient number, since it is larger than the sum of its proper divisors (11755023).

717052621 is a wasteful number, since it uses less digits than its factorization.

717052621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11755022.

The product of its (nonzero) digits is 5880, while the sum is 31.

The square root of 717052621 is about 26777.8382435924. The cubic root of 717052621 is about 895.0562768520.

The spelling of 717052621 in words is "seven hundred seventeen million, fifty-two thousand, six hundred twenty-one".