108431245521 has 81 divisors (see below), whose sum is σ = 170037644049. Its totient is φ = 66574332864.

The previous prime is 108431245513. The next prime is 108431245523. The reversal of 108431245521 is 125542134801.

The square root of 108431245521 is 329289.

It is a perfect power (a square), and thus also a powerful number.

108431245521 is a `hidden beast` number, since 1 + 0 + 8 + 4 + 3 + 124 + 5 + 521 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 18948899025 + 89482346496 = 137655^2 + 299136^2 .

It is not a de Polignac number, because 108431245521 - 2³ = 108431245513 is a prime.

It is a super-2 number, since 2×108431245521² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (108431245523) by changing a digit.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 994782015 + ... + 994782123.

Almost surely, 2^108431245521 is an apocalyptic number.

108431245521 is the 329289-th square number.

108431245521 is the 164645-th centered octagonal number.

It is an amenable number.

108431245521 is a deficient number, since it is larger than the sum of its proper divisors (61606398528).

108431245521 is an equidigital number, since it uses as much as digits as its factorization.

108431245521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 368 (or 184 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 36.

Multiplying 108431245521 by its sum of digits (36), we get a square (3903524838756 = 1975734²).

The spelling of 108431245521 in words is "one hundred eight billion, four hundred thirty-one million, two hundred forty-five thousand, five hundred twenty-one".