123231131 has 4 divisors (see below), whose sum is σ = 129717000. Its totient is φ = 116745264.

The previous prime is 123231109. The next prime is 123231161. The reversal of 123231131 is 131132321.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123231131 is a prime.

It is a super-2 number, since 2×123231131² = 30371823295078322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123231161) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3242906 + ... + 3242943.

It is an arithmetic number, because the mean of its divisors is an integer number (32429250).

Almost surely, 2^123231131 is an apocalyptic number.

123231131 is a deficient number, since it is larger than the sum of its proper divisors (6485869).

123231131 is an equidigital number, since it uses as much as digits as its factorization.

123231131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6485868.

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

The square root of 123231131 is about 11100.9518060390. The cubic root of 123231131 is about 497.6302947367.

Adding to 123231131 its reverse (131132321), we get a palindrome (254363452).

The spelling of 123231131 in words is "one hundred twenty-three million, two hundred thirty-one thousand, one hundred thirty-one".