231315655 has 4 divisors (see below), whose sum is σ = 277578792. Its totient is φ = 185052520.

The previous prime is 231315613. The next prime is 231315659. The reversal of 231315655 is 556513132.

It is a semiprime because it is the product of two primes.

It is a de Polignac number, because none of the positive numbers 2^k-231315655 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231315659) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23131561 + ... + 23131570.

It is an arithmetic number, because the mean of its divisors is an integer number (69394698).

Almost surely, 2^231315655 is an apocalyptic number.

231315655 is a deficient number, since it is larger than the sum of its proper divisors (46263137).

231315655 is an equidigital number, since it uses as much as digits as its factorization.

231315655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46263136.

The product of its digits is 13500, while the sum is 31.

The square root of 231315655 is about 15209.0648956469. The cubic root of 231315655 is about 613.8585963530.

Adding to 231315655 its reverse (556513132), we get a palindrome (787828787).

The spelling of 231315655 in words is "two hundred thirty-one million, three hundred fifteen thousand, six hundred fifty-five".