123431431 has 2 divisors, whose sum is σ = 123431432. Its totient is φ = 123431430.

The previous prime is 123431401. The next prime is 123431459. The reversal of 123431431 is 134134321.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 123431431 - 2⁷ = 123431303 is a prime.

It is a super-2 number, since 2×123431431² = 30470636317415522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123431401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61715715 + 61715716.

It is an arithmetic number, because the mean of its divisors is an integer number (61715716).

Almost surely, 2^123431431 is an apocalyptic number.

123431431 is a deficient number, since it is larger than the sum of its proper divisors (1).

123431431 is an equidigital number, since it uses as much as digits as its factorization.

123431431 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 864, while the sum is 22.

The square root of 123431431 is about 11109.9698919484. The cubic root of 123431431 is about 497.8997650451.

Adding to 123431431 its reverse (134134321), we get a palindrome (257565752).

The spelling of 123431431 in words is "one hundred twenty-three million, four hundred thirty-one thousand, four hundred thirty-one".