231147 has 16 divisors (see below), whose sum is σ = 391680. Its totient is φ = 131976.

The previous prime is 231131. The next prime is 231169. The reversal of 231147 is 741132.

It is not a de Polignac number, because 231147 - 2⁴ = 231131 is a prime.

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

231147 is a lucky 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 231147.

It is not an unprimeable number, because it can be changed into a prime (231107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 423 + ... + 800.

It is an arithmetic number, because the mean of its divisors is an integer number (24480).

2²³¹¹⁴⁷ is an apocalyptic number.

231147 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

231147 is a deficient number, since it is larger than the sum of its proper divisors (160533).

231147 is a wasteful number, since it uses less digits than its factorization.

231147 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1239 (or 1233 counting only the distinct ones).

The product of its digits is 168, while the sum is 18.

The square root of 231147 is about 480.7774953136. Note that the first 3 decimals coincide. The cubic root of 231147 is about 61.3709369541.

Adding to 231147 its reverse (741132), we get a palindrome (972279).

It can be divided in two parts, 231 and 147, that added together give a triangular number (378 = T₂₇).

The spelling of 231147 in words is "two hundred thirty-one thousand, one hundred forty-seven".