231057009 has 16 divisors (see below), whose sum is σ = 343136640. Its totient is φ = 153664560.

The previous prime is 231056999. The next prime is 231057019. The reversal of 231057009 is 900750132.

It is an interprime number because it is at equal distance from previous prime (231056999) and next prime (231057019).

It is not a de Polignac number, because 231057009 - 2¹⁹ = 230532721 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (231057019) 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, 1204 + ... + 21530.

It is an arithmetic number, because the mean of its divisors is an integer number (21446040).

Almost surely, 2^231057009 is an apocalyptic number.

It is an amenable number.

231057009 is a deficient number, since it is larger than the sum of its proper divisors (112079631).

231057009 is a wasteful number, since it uses less digits than its factorization.

231057009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20757 (or 20751 counting only the distinct ones).

The product of its (nonzero) digits is 1890, while the sum is 27.

The square root of 231057009 is about 15200.5594962817. The cubic root of 231057009 is about 613.6297153399.

It can be divided in two parts, 2310 and 57009, that added together give a cube (59319 = 39³).

The spelling of 231057009 in words is "two hundred thirty-one million, fifty-seven thousand, nine".