917231997 has 8 divisors (see below), whose sum is σ = 1334155680. Its totient is φ = 555898160.

The previous prime is 917231977. The next prime is 917232007. The reversal of 917231997 is 799132719.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 917231997 - 2⁸ = 917231741 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (917231947) 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, 13897422 + ... + 13897487.

It is an arithmetic number, because the mean of its divisors is an integer number (166769460).

Almost surely, 2^917231997 is an apocalyptic number.

It is an amenable number.

917231997 is a deficient number, since it is larger than the sum of its proper divisors (416923683).

917231997 is a wasteful number, since it uses less digits than its factorization.

917231997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27794923.

The product of its digits is 214326, while the sum is 48.

The square root of 917231997 is about 30285.8382251507. The cubic root of 917231997 is about 971.6124373617.

The spelling of 917231997 in words is "nine hundred seventeen million, two hundred thirty-one thousand, nine hundred ninety-seven".