128975131 has 4 divisors (see below), whose sum is σ = 129019000. Its totient is φ = 128931264.

The previous prime is 128975123. The next prime is 128975137. The reversal of 128975131 is 131579821.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 128975131 - 2³ = 128975123 is a prime.

It is a super-2 number, since 2×128975131² = 33269168832934322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128975137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17181 + ... + 23518.

It is an arithmetic number, because the mean of its divisors is an integer number (32254750).

Almost surely, 2^128975131 is an apocalyptic number.

128975131 is a deficient number, since it is larger than the sum of its proper divisors (43869).

128975131 is an equidigital number, since it uses as much as digits as its factorization.

128975131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43868.

The product of its digits is 15120, while the sum is 37.

The square root of 128975131 is about 11356.7218421515. The cubic root of 128975131 is about 505.2449630100.

The spelling of 128975131 in words is "one hundred twenty-eight million, nine hundred seventy-five thousand, one hundred thirty-one".