917020889 has 4 divisors (see below), whose sum is σ = 946602240. Its totient is φ = 887439540.

The previous prime is 917020847. The next prime is 917020891. The reversal of 917020889 is 988020719.

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: 988020719 = 7 ⋅141145817.

It is a cyclic number.

It is not a de Polignac number, because 917020889 - 2⁸ = 917020633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (917023889) 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, 14790629 + ... + 14790690.

It is an arithmetic number, because the mean of its divisors is an integer number (236650560).

Almost surely, 2^917020889 is an apocalyptic number.

It is an amenable number.

917020889 is a deficient number, since it is larger than the sum of its proper divisors (29581351).

917020889 is a wasteful number, since it uses less digits than its factorization.

917020889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29581350.

The product of its (nonzero) digits is 72576, while the sum is 44.

The square root of 917020889 is about 30282.3527652658. The cubic root of 917020889 is about 971.5378902833.

The spelling of 917020889 in words is "nine hundred seventeen million, twenty thousand, eight hundred eighty-nine".