123431111 has 2 divisors, whose sum is σ = 123431112. Its totient is φ = 123431110.

The previous prime is 123431093. The next prime is 123431123. The reversal of 123431111 is 111134321.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 123431111 - 2¹⁴ = 123414727 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 123431111.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123431131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61715555 + 61715556.

It is an arithmetic number, because the mean of its divisors is an integer number (61715556).

Almost surely, 2^123431111 is an apocalyptic number.

123431111 is a deficient number, since it is larger than the sum of its proper divisors (1).

123431111 is an equidigital number, since it uses as much as digits as its factorization.

123431111 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72, while the sum is 17.

The square root of 123431111 is about 11109.9554904599. The cubic root of 123431111 is about 497.8993347709.

Adding to 123431111 its reverse (111134321), we get a palindrome (234565432).

The spelling of 123431111 in words is "one hundred twenty-three million, four hundred thirty-one thousand, one hundred eleven".