231331055 has 4 divisors (see below), whose sum is σ = 277597272. Its totient is φ = 185064840.

The previous prime is 231331049. The next prime is 231331069. The reversal of 231331055 is 550133132.

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

It is not a de Polignac number, because 231331055 - 2¹² = 231326959 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 231331055.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23133101 + ... + 23133110.

It is an arithmetic number, because the mean of its divisors is an integer number (69399318).

Almost surely, 2^231331055 is an apocalyptic number.

231331055 is a deficient number, since it is larger than the sum of its proper divisors (46266217).

231331055 is an equidigital number, since it uses as much as digits as its factorization.

231331055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46266216.

The product of its (nonzero) digits is 1350, while the sum is 23.

The square root of 231331055 is about 15209.5711642373. The cubic root of 231331055 is about 613.8722187378.

Adding to 231331055 its reverse (550133132), we get a palindrome (781464187).

The spelling of 231331055 in words is "two hundred thirty-one million, three hundred thirty-one thousand, fifty-five".