231045 has 16 divisors (see below), whose sum is σ = 376512. Its totient is φ = 120960.

The previous prime is 231041. The next prime is 231053. The reversal of 231045 is 540132.

231045 = T₇₈ + T₇₉ + ... + T₁₂₂.

It is not a de Polignac number, because 231045 - 2² = 231041 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231041) 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, 990 + ... + 1200.

It is an arithmetic number, because the mean of its divisors is an integer number (23532).

2²³¹⁰⁴⁵ is an apocalyptic number.

It is an amenable number.

231045 is a deficient number, since it is larger than the sum of its proper divisors (145467).

231045 is a wasteful number, since it uses less digits than its factorization.

231045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 292.

The product of its (nonzero) digits is 120, while the sum is 15.

The square root of 231045 is about 480.6714054320. The cubic root of 231045 is about 61.3619084187.

Adding to 231045 its reverse (540132), we get a palindrome (771177).

The spelling of 231045 in words is "two hundred thirty-one thousand, forty-five".