128957137 has 4 divisors (see below), whose sum is σ = 130140340. Its totient is φ = 127773936.

The previous prime is 128957119. The next prime is 128957167. The reversal of 128957137 is 731759821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 731759821 = 13 ⋅56289217.

It can be written as a sum of positive squares in 2 ways, for example, as 66846976 + 62110161 = 8176^2 + 7881^2 .

It is a cyclic number.

It is not a de Polignac number, because 128957137 - 2²³ = 120568529 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 128957093 and 128957102.

It is not an unprimeable number, because it can be changed into a prime (128957107) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 591438 + ... + 591655.

It is an arithmetic number, because the mean of its divisors is an integer number (32535085).

Almost surely, 2^128957137 is an apocalyptic number.

It is an amenable number.

128957137 is a deficient number, since it is larger than the sum of its proper divisors (1183203).

128957137 is a wasteful number, since it uses less digits than its factorization.

128957137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1183202.

The product of its digits is 105840, while the sum is 43.

The square root of 128957137 is about 11355.9295964707. The cubic root of 128957137 is about 505.2214654550.

The spelling of 128957137 in words is "one hundred twenty-eight million, nine hundred fifty-seven thousand, one hundred thirty-seven".