231129 has 12 divisors (see below), whose sum is σ = 340132. Its totient is φ = 151200.

The previous prime is 231109. The next prime is 231131. The reversal of 231129 is 921132.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 3600 + 227529 = 60^2 + 477^2 .

It is not a de Polignac number, because 231129 - 2⁷ = 231001 is a prime.

It is a super-2 number, since 2×231129² = 106841229282, which contains 22 as substring.

It is a Duffinian number.

231129 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231109) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 339 + ... + 759.

2²³¹¹²⁹ is an apocalyptic number.

It is an amenable number.

231129 is a deficient number, since it is larger than the sum of its proper divisors (109003).

231129 is a wasteful number, since it uses less digits than its factorization.

231129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 488 (or 485 counting only the distinct ones).

The product of its digits is 108, while the sum is 18.

The square root of 231129 is about 480.7587752709. The cubic root of 231129 is about 61.3693438762.

The spelling of 231129 in words is "two hundred thirty-one thousand, one hundred twenty-nine".