231555 has 16 divisors (see below), whose sum is σ = 380160. Its totient is φ = 120288.

The previous prime is 231551. The next prime is 231559. The reversal of 231555 is 555132.

231555 is nontrivially palindromic in base 16.

231555 is digitally balanced in base 7, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (231551) and next prime (231559).

It is not a de Polignac number, because 231555 - 2² = 231551 is a prime.

231555 is strictly pandigital in base 7.

It is not an unprimeable number, because it can be changed into a prime (231551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 466 + ... + 824.

It is an arithmetic number, because the mean of its divisors is an integer number (23760).

2²³¹⁵⁵⁵ is an apocalyptic number.

231555 is a deficient number, since it is larger than the sum of its proper divisors (148605).

231555 is a wasteful number, since it uses less digits than its factorization.

231555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 410.

The product of its digits is 750, while the sum is 21.

The square root of 231555 is about 481.2016209449. The cubic root of 231555 is about 61.4070245582.

Adding to 231555 its reverse (555132), we get a palindrome (786687).

The spelling of 231555 in words is "two hundred thirty-one thousand, five hundred fifty-five".