128831988531 has 8 divisors (see below), whose sum is σ = 171794829520. Its totient is φ = 85878569952.

The previous prime is 128831988529. The next prime is 128831988581. The reversal of 128831988531 is 135889138821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 128831988531 - 2¹ = 128831988529 is a prime.

It is a super-2 number, since 2×128831988531² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128831988521) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2323636 + ... + 2378433.

It is an arithmetic number, because the mean of its divisors is an integer number (21474353690).

Almost surely, 2^128831988531 is an apocalyptic number.

128831988531 is a deficient number, since it is larger than the sum of its proper divisors (42962840989).

128831988531 is an equidigital number, since it uses as much as digits as its factorization.

128831988531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4711205.

The product of its digits is 3317760, while the sum is 57.

The spelling of 128831988531 in words is "one hundred twenty-eight billion, eight hundred thirty-one million, nine hundred eighty-eight thousand, five hundred thirty-one".