975128139 has 12 divisors (see below), whose sum is σ = 1460686136. Its totient is φ = 650085264.

The previous prime is 975128123. The next prime is 975128149. The reversal of 975128139 is 931821579.

It is not a de Polignac number, because 975128139 - 2⁴ = 975128123 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 975128094 and 975128103.

It is not an unprimeable number, because it can be changed into a prime (975128149) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2006194 + ... + 2006679.

Almost surely, 2^975128139 is an apocalyptic number.

975128139 is a deficient number, since it is larger than the sum of its proper divisors (485557997).

975128139 is an equidigital number, since it uses as much as digits as its factorization.

975128139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4012888 (or 4012876 counting only the distinct ones).

The product of its digits is 136080, while the sum is 45.

The square root of 975128139 is about 31227.0417907300. The cubic root of 975128139 is about 991.6396794890.

The spelling of 975128139 in words is "nine hundred seventy-five million, one hundred twenty-eight thousand, one hundred thirty-nine".