231116231 has 2 divisors, whose sum is σ = 231116232. Its totient is φ = 231116230.

The previous prime is 231116183. The next prime is 231116257. The reversal of 231116231 is 132611132.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 231116231 - 2²² = 226921927 is a prime.

It is a super-2 number, since 2×231116231² = 106829424463290722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231116261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115558115 + 115558116.

It is an arithmetic number, because the mean of its divisors is an integer number (115558116).

Almost surely, 2^231116231 is an apocalyptic number.

231116231 is a deficient number, since it is larger than the sum of its proper divisors (1).

231116231 is an equidigital number, since it uses as much as digits as its factorization.

231116231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 216, while the sum is 20.

The square root of 231116231 is about 15202.5073918745. The cubic root of 231116231 is about 613.6821371423.

Adding to 231116231 its reverse (132611132), we get a palindrome (363727363).

The spelling of 231116231 in words is "two hundred thirty-one million, one hundred sixteen thousand, two hundred thirty-one".