231131123 has 2 divisors, whose sum is σ = 231131124. Its totient is φ = 231131122.

The previous prime is 231131111. The next prime is 231131129. The reversal of 231131123 is 321131132.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 231131123 - 2⁶ = 231131059 is a prime.

It is a super-2 number, since 2×231131123² = 106843192038482258, which contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (231131129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115565561 + 115565562.

It is an arithmetic number, because the mean of its divisors is an integer number (115565562).

Almost surely, 2^231131123 is an apocalyptic number.

231131123 is a deficient number, since it is larger than the sum of its proper divisors (1).

231131123 is an equidigital number, since it uses as much as digits as its factorization.

231131123 is an evil number, because the sum of its binary digits is even.

The product of its digits is 108, while the sum is 17.

The square root of 231131123 is about 15202.9971716106. The cubic root of 231131123 is about 613.6953177515.

Adding to 231131123 its reverse (321131132), we get a palindrome (552262255).

Subtracting 231131123 from its reverse (321131132), we obtain a palindrome (90000009).

The spelling of 231131123 in words is "two hundred thirty-one million, one hundred thirty-one thousand, one hundred twenty-three".