999989072597 has 4 divisors (see below), whose sum is σ = 1000128412236. Its totient is φ = 999849732960.

The previous prime is 999989072531. The next prime is 999989072629. The reversal of 999989072597 is 795270989999.

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 942829348036 + 57159724561 = 970994^2 + 239081^2 .

It is a cyclic number.

It is not a de Polignac number, because 999989072597 - 2³⁰ = 998915330773 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999989077597) 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, 69659054 + ... + 69673407.

It is an arithmetic number, because the mean of its divisors is an integer number (250032103059).

Almost surely, 2^999989072597 is an apocalyptic number.

It is an amenable number.

999989072597 is a deficient number, since it is larger than the sum of its proper divisors (139339639).

999989072597 is a wasteful number, since it uses less digits than its factorization.

999989072597 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139339638.

The product of its (nonzero) digits is 2083248720, while the sum is 83.

The spelling of 999989072597 in words is "nine hundred ninety-nine billion, nine hundred eighty-nine million, seventy-two thousand, five hundred ninety-seven".