231031123 has 2 divisors, whose sum is σ = 231031124. Its totient is φ = 231031122.

The previous prime is 231031121. The next prime is 231031133. The reversal of 231031123 is 321130132.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 231031123 - 2¹ = 231031121 is a prime.

It is a super-2 number, since 2×231031123² = 106750759589282258, which contains 22 as substring.

Together with 231031121, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 231031097 and 231031106.

It is not a weakly prime, because it can be changed into another prime (231031121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115515561 + 115515562.

It is an arithmetic number, because the mean of its divisors is an integer number (115515562).

Almost surely, 2^231031123 is an apocalyptic number.

231031123 is a deficient number, since it is larger than the sum of its proper divisors (1).

231031123 is an equidigital number, since it uses as much as digits as its factorization.

231031123 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108, while the sum is 16.

The square root of 231031123 is about 15199.7079906161. The cubic root of 231031123 is about 613.6067989002.

Adding to 231031123 its reverse (321130132), we get a palindrome (552161255).

Subtracting 231031123 from its reverse (321130132), we obtain a palindrome (90099009).

It can be divided in two parts, 2310 and 31123, that added together give a palindrome (33433).

The spelling of 231031123 in words is "two hundred thirty-one million, thirty-one thousand, one hundred twenty-three".