128692131 has 16 divisors (see below), whose sum is σ = 175341600. Its totient is φ = 83939328.

The previous prime is 128692093. The next prime is 128692139. The reversal of 128692131 is 131296821.

It is not a de Polignac number, because 128692131 - 2¹⁰ = 128691107 is a prime.

It is a super-2 number, since 2×128692131² = 33123329162642322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 128692092 and 128692101.

It is not an unprimeable number, because it can be changed into a prime (128692139) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23415 + ... + 28383.

It is an arithmetic number, because the mean of its divisors is an integer number (10958850).

Almost surely, 2^128692131 is an apocalyptic number.

128692131 is a deficient number, since it is larger than the sum of its proper divisors (46649469).

128692131 is an equidigital number, since it uses as much as digits as its factorization.

128692131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5158.

The product of its digits is 5184, while the sum is 33.

The square root of 128692131 is about 11344.2554184927. The cubic root of 128692131 is about 504.8751526162.

The spelling of 128692131 in words is "one hundred twenty-eight million, six hundred ninety-two thousand, one hundred thirty-one".