231313231 has 4 divisors (see below), whose sum is σ = 241370352. Its totient is φ = 221256112.

The previous prime is 231313223. The next prime is 231313301. The reversal of 231313231 is 132313132.

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

It is a cyclic number.

It is not a de Polignac number, because 231313231 - 2³ = 231313223 is a prime.

It is a super-2 number, since 2×231313231² = 107011621671318722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 231313199 and 231313208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231313031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5028526 + ... + 5028571.

It is an arithmetic number, because the mean of its divisors is an integer number (60342588).

Almost surely, 2^231313231 is an apocalyptic number.

231313231 is a deficient number, since it is larger than the sum of its proper divisors (10057121).

231313231 is a wasteful number, since it uses less digits than its factorization.

231313231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10057120.

The product of its digits is 324, while the sum is 19.

The square root of 231313231 is about 15208.9852061208. The cubic root of 231313231 is about 613.8564520991.

Adding to 231313231 its reverse (132313132), we get a palindrome (363626363).

Subtracting from 231313231 its reverse (132313132), we obtain a palindrome (99000099).

It can be divided in two parts, 23131 and 3231, that added together give a palindrome (26362).

The spelling of 231313231 in words is "two hundred thirty-one million, three hundred thirteen thousand, two hundred thirty-one".