123431719 has 2 divisors, whose sum is σ = 123431720. Its totient is φ = 123431718.

The previous prime is 123431699. The next prime is 123431723. The reversal of 123431719 is 917134321.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 123431719 - 2⁹ = 123431207 is a prime.

It is a super-2 number, since 2×123431719² = 30470778510589922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123434719) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61715859 + 61715860.

It is an arithmetic number, because the mean of its divisors is an integer number (61715860).

Almost surely, 2^123431719 is an apocalyptic number.

123431719 is a deficient number, since it is larger than the sum of its proper divisors (1).

123431719 is an equidigital number, since it uses as much as digits as its factorization.

123431719 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4536, while the sum is 31.

The square root of 123431719 is about 11109.9828532721. The cubic root of 123431719 is about 497.9001522912.

The spelling of 123431719 in words is "one hundred twenty-three million, four hundred thirty-one thousand, seven hundred nineteen".