128570231 has 4 divisors (see below), whose sum is σ = 129236592. Its totient is φ = 127903872.

The previous prime is 128570213. The next prime is 128570251. The reversal of 128570231 is 132075821.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128570231 is a prime.

It is a super-2 number, since 2×128570231² = 33060608598786722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 128570194 and 128570203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128570251) 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, 332891 + ... + 333276.

It is an arithmetic number, because the mean of its divisors is an integer number (32309148).

Almost surely, 2^128570231 is an apocalyptic number.

128570231 is a deficient number, since it is larger than the sum of its proper divisors (666361).

128570231 is an equidigital number, since it uses as much as digits as its factorization.

128570231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 666360.

The product of its (nonzero) digits is 3360, while the sum is 29.

The square root of 128570231 is about 11338.8813822176. The cubic root of 128570231 is about 504.7156926635.

The spelling of 128570231 in words is "one hundred twenty-eight million, five hundred seventy thousand, two hundred thirty-one".