917423521 has 9 divisors (see below), whose sum is σ = 1067453649. Its totient is φ = 786181284.

The previous prime is 917423519. The next prime is 917423623. The reversal of 917423521 is 125324719.

It is a happy number.

The square root of 917423521 is 30289.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 917423521 - 2¹ = 917423519 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (917423321) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 209860 + ... + 214186.

It is an arithmetic number, because the mean of its divisors is an integer number (118605961).

Almost surely, 2^917423521 is an apocalyptic number.

917423521 is the 30289-th square number.

917423521 is the 15145-th centered octagonal number.

It is an amenable number.

917423521 is a deficient number, since it is larger than the sum of its proper divisors (150030128).

917423521 is an frugal number, since it uses more digits than its factorization.

917423521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8668 (or 4334 counting only the distinct ones).

The product of its digits is 15120, while the sum is 34.

The cubic root of 917423521 is about 971.6800589851.

The spelling of 917423521 in words is "nine hundred seventeen million, four hundred twenty-three thousand, five hundred twenty-one".