917489009 has 4 divisors (see below), whose sum is σ = 919119216. Its totient is φ = 915858804.

The previous prime is 917488987. The next prime is 917489011. The reversal of 917489009 is 900984719.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 900984719 = 43 ⋅20953133.

It is a cyclic number.

It is not a de Polignac number, because 917489009 - 2²⁴ = 900711793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (917489029) 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, 814259 + ... + 815384.

It is an arithmetic number, because the mean of its divisors is an integer number (229779804).

Almost surely, 2^917489009 is an apocalyptic number.

It is an amenable number.

917489009 is a deficient number, since it is larger than the sum of its proper divisors (1630207).

917489009 is a wasteful number, since it uses less digits than its factorization.

917489009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1630206.

The product of its (nonzero) digits is 163296, while the sum is 47.

The square root of 917489009 is about 30290.0810332359. The cubic root of 917489009 is about 971.7031787577.

The spelling of 917489009 in words is "nine hundred seventeen million, four hundred eighty-nine thousand, nine".