231156 has 18 divisors (see below), whose sum is σ = 584402. Its totient is φ = 77040.

The previous prime is 231131. The next prime is 231169. The reversal of 231156 is 651132.

It can be written as a sum of positive squares in only one way, i.e., 176400 + 54756 = 420^2 + 234^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a hoax number, since the sum of its digits (18) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an Ulam number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 231156.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3175 + ... + 3246.

2²³¹¹⁵⁶ is an apocalyptic number.

It is an amenable number.

231156 is an abundant number, since it is smaller than the sum of its proper divisors (353246).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

231156 is a wasteful number, since it uses less digits than its factorization.

231156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6431 (or 6426 counting only the distinct ones).

The product of its digits is 180, while the sum is 18.

The square root of 231156 is about 480.7868550616. The cubic root of 231156 is about 61.3717334620.

Adding to 231156 its reverse (651132), we get a palindrome (882288).

The spelling of 231156 in words is "two hundred thirty-one thousand, one hundred fifty-six".