123313431 has 4 divisors (see below), whose sum is σ = 164417912. Its totient is φ = 82208952.

The previous prime is 123313417. The next prime is 123313441. The reversal of 123313431 is 134313321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 134313321 = 3 ⋅44771107.

It is not a de Polignac number, because 123313431 - 2⁶ = 123313367 is a prime.

It is a super-2 number, since 2×123313431² = 30412404529983522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 123313398 and 123313407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123313441) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20552236 + ... + 20552241.

It is an arithmetic number, because the mean of its divisors is an integer number (41104478).

Almost surely, 2^123313431 is an apocalyptic number.

123313431 is a deficient number, since it is larger than the sum of its proper divisors (41104481).

123313431 is an equidigital number, since it uses as much as digits as its factorization.

123313431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41104480.

The product of its digits is 648, while the sum is 21.

The square root of 123313431 is about 11104.6580766812. The cubic root of 123313431 is about 497.7410510016.

Adding to 123313431 its reverse (134313321), we get a palindrome (257626752).

The spelling of 123313431 in words is "one hundred twenty-three million, three hundred thirteen thousand, four hundred thirty-one".