123249431 has 2 divisors, whose sum is σ = 123249432. Its totient is φ = 123249430.

The previous prime is 123249419. The next prime is 123249443. The reversal of 123249431 is 134942321.

It is a balanced prime because it is at equal distance from previous prime (123249419) and next prime (123249443).

It is a cyclic number.

It is not a de Polignac number, because 123249431 - 2¹⁰ = 123248407 is a prime.

It is a super-2 number, since 2×123249431² = 30380844483647522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 123249394 and 123249403.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123249131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61624715 + 61624716.

It is an arithmetic number, because the mean of its divisors is an integer number (61624716).

Almost surely, 2^123249431 is an apocalyptic number.

123249431 is a deficient number, since it is larger than the sum of its proper divisors (1).

123249431 is an equidigital number, since it uses as much as digits as its factorization.

123249431 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5184, while the sum is 29.

The square root of 123249431 is about 11101.7760290865. The cubic root of 123249431 is about 497.6549264554.

The spelling of 123249431 in words is "one hundred twenty-three million, two hundred forty-nine thousand, four hundred thirty-one".