123811431 has 16 divisors (see below), whose sum is σ = 171437280. Its totient is φ = 79418880.

The previous prime is 123811417. The next prime is 123811447. The reversal of 123811431 is 134118321.

It is not a de Polignac number, because 123811431 - 2⁵ = 123811399 is a prime.

It is a super-2 number, since 2×123811431² = 30658540892535522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123811451) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2085 + ... + 15873.

It is an arithmetic number, because the mean of its divisors is an integer number (10714830).

Almost surely, 2^123811431 is an apocalyptic number.

123811431 is a deficient number, since it is larger than the sum of its proper divisors (47625849).

123811431 is a wasteful number, since it uses less digits than its factorization.

123811431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13906.

The product of its digits is 576, while the sum is 24.

The square root of 123811431 is about 11127.0585061821. The cubic root of 123811431 is about 498.4101917102.

Adding to 123811431 its reverse (134118321), we get a palindrome (257929752).

The spelling of 123811431 in words is "one hundred twenty-three million, eight hundred eleven thousand, four hundred thirty-one".