123132431 has 4 divisors (see below), whose sum is σ = 123916872. Its totient is φ = 122347992.

The previous prime is 123132421. The next prime is 123132461. The reversal of 123132431 is 134231321.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 123132431 - 2⁶ = 123132367 is a prime.

It is a super-2 number, since 2×123132431² = 30323191127939522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123132421) 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, 391985 + ... + 392298.

It is an arithmetic number, because the mean of its divisors is an integer number (30979218).

Almost surely, 2^123132431 is an apocalyptic number.

123132431 is a deficient number, since it is larger than the sum of its proper divisors (784441).

123132431 is an equidigital number, since it uses as much as digits as its factorization.

123132431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 784440.

The product of its digits is 432, while the sum is 20.

The square root of 123132431 is about 11096.5053507850. The cubic root of 123132431 is about 497.4974029140.

Adding to 123132431 its reverse (134231321), we get a palindrome (257363752).

The spelling of 123132431 in words is "one hundred twenty-three million, one hundred thirty-two thousand, four hundred thirty-one".