231312231 has 6 divisors (see below), whose sum is σ = 334117680. Its totient is φ = 154208148.

The previous prime is 231312209. The next prime is 231312233. The reversal of 231312231 is 132213132.

It is not a de Polignac number, because 231312231 - 2⁶ = 231312167 is a prime.

It is a super-2 number, since 2×231312231² = 107010696420394722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231312233) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12850671 + ... + 12850688.

It is an arithmetic number, because the mean of its divisors is an integer number (55686280).

Almost surely, 2^231312231 is an apocalyptic number.

231312231 is a deficient number, since it is larger than the sum of its proper divisors (102805449).

231312231 is a wasteful number, since it uses less digits than its factorization.

231312231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25701365 (or 25701362 counting only the distinct ones).

The product of its digits is 216, while the sum is 18.

The square root of 231312231 is about 15208.9523307820. The cubic root of 231312231 is about 613.8555675016.

Adding to 231312231 its reverse (132213132), we get a palindrome (363525363).

Subtracting from 231312231 its reverse (132213132), we obtain a palindrome (99099099).

The spelling of 231312231 in words is "two hundred thirty-one million, three hundred twelve thousand, two hundred thirty-one".