123426731 has 2 divisors, whose sum is σ = 123426732. Its totient is φ = 123426730.

The previous prime is 123426707. The next prime is 123426733. The reversal of 123426731 is 137624321.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 123426731 - 2²⁶ = 56317867 is a prime.

It is a super-2 number, since 2×123426731² = 30468315850692722, which contains 22 as substring.

Together with 123426733, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 123426694 and 123426703.

It is not a weakly prime, because it can be changed into another prime (123426733) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61713365 + 61713366.

It is an arithmetic number, because the mean of its divisors is an integer number (61713366).

Almost surely, 2^123426731 is an apocalyptic number.

123426731 is a deficient number, since it is larger than the sum of its proper divisors (1).

123426731 is an equidigital number, since it uses as much as digits as its factorization.

123426731 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6048, while the sum is 29.

The square root of 123426731 is about 11109.7583682095. The cubic root of 123426731 is about 497.8934453187.

The spelling of 123426731 in words is "one hundred twenty-three million, four hundred twenty-six thousand, seven hundred thirty-one".