123231431 has 2 divisors, whose sum is σ = 123231432. Its totient is φ = 123231430.

The previous prime is 123231403. The next prime is 123231443. The reversal of 123231431 is 134132321.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 123231431 - 2¹⁰ = 123230407 is a prime.

It is a super-2 number, since 2×123231431² = 30371971172615522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123231491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61615715 + 61615716.

It is an arithmetic number, because the mean of its divisors is an integer number (61615716).

Almost surely, 2^123231431 is an apocalyptic number.

123231431 is a deficient number, since it is larger than the sum of its proper divisors (1).

123231431 is an equidigital number, since it uses as much as digits as its factorization.

123231431 is an odious number, because the sum of its binary digits is odd.

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

The square root of 123231431 is about 11100.9653183856. The cubic root of 123231431 is about 497.6306985550.

Adding to 123231431 its reverse (134132321), we get a palindrome (257363752).

The spelling of 123231431 in words is "one hundred twenty-three million, two hundred thirty-one thousand, four hundred thirty-one".