13123431 has 8 divisors (see below), whose sum is σ = 19442160. Its totient is φ = 8748936.

The previous prime is 13123423. The next prime is 13123441. The reversal of 13123431 is 13432131.

It is not a de Polignac number, because 13123431 - 2³ = 13123423 is a prime.

It is a super-2 number, since 2×13123431² = 344448882423522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13123441) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 243000 + ... + 243053.

It is an arithmetic number, because the mean of its divisors is an integer number (2430270).

Almost surely, 2^13123431 is an apocalyptic number.

13123431 is a deficient number, since it is larger than the sum of its proper divisors (6318729).

13123431 is an equidigital number, since it uses as much as digits as its factorization.

13123431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 486062 (or 486056 counting only the distinct ones).

The product of its digits is 216, while the sum is 18.

The square root of 13123431 is about 3622.6276375029. The cubic root of 13123431 is about 235.8752991976.

Adding to 13123431 its reverse (13432131), we get a palindrome (26555562).

The spelling of 13123431 in words is "thirteen million, one hundred twenty-three thousand, four hundred thirty-one".