923988969521 has 24 divisors (see below), whose sum is σ = 962755388712. Its totient is φ = 886705747200.

The previous prime is 923988969481. The next prime is 923988969523. The reversal of 923988969521 is 125969889329.

It can be written as a sum of positive squares in 4 ways, for example, as 341247578896 + 582741390625 = 584164^2 + 763375^2 .

It is a de Polignac number, because none of the positive numbers 2^k-923988969521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (923988969523) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 143897891 + ... + 143904311.

It is an arithmetic number, because the mean of its divisors is an integer number (40114807863).

Almost surely, 2^923988969521 is an apocalyptic number.

It is an amenable number.

923988969521 is a deficient number, since it is larger than the sum of its proper divisors (38766419191).

923988969521 is a wasteful number, since it uses less digits than its factorization.

923988969521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7713 (or 7682 counting only the distinct ones).

The product of its digits is 151165440, while the sum is 71.

The spelling of 923988969521 in words is "nine hundred twenty-three billion, nine hundred eighty-eight million, nine hundred sixty-nine thousand, five hundred twenty-one".