123431231 has 16 divisors (see below), whose sum is σ = 154441728. Its totient is φ = 95834400.

The previous prime is 123431227. The next prime is 123431233. The reversal of 123431231 is 132134321.

It is a cyclic number.

It is not a de Polignac number, because 123431231 - 2² = 123431227 is a prime.

It is a super-2 number, since 2×123431231² = 30470537572350722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123431233) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19826 + ... + 25296.

It is an arithmetic number, because the mean of its divisors is an integer number (9652608).

Almost surely, 2^123431231 is an apocalyptic number.

123431231 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

123431231 is a deficient number, since it is larger than the sum of its proper divisors (31010497).

123431231 is a wasteful number, since it uses less digits than its factorization.

123431231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5782.

The product of its digits is 432, while the sum is 20.

The square root of 123431231 is about 11109.9608910203. The cubic root of 123431231 is about 497.8994961238.

Adding to 123431231 its reverse (132134321), we get a palindrome (255565552).

The spelling of 123431231 in words is "one hundred twenty-three million, four hundred thirty-one thousand, two hundred thirty-one".