123100431 has 4 divisors (see below), whose sum is σ = 164133912. Its totient is φ = 82066952.

The previous prime is 123100427. The next prime is 123100441. The reversal of 123100431 is 134001321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 134001321 = 3 ⋅44667107.

It is a cyclic number.

It is not a de Polignac number, because 123100431 - 2² = 123100427 is a prime.

It is a super-2 number, since 2×123100431² = 30307432224771522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 123100431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123100441) 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, 20516736 + ... + 20516741.

It is an arithmetic number, because the mean of its divisors is an integer number (41033478).

Almost surely, 2^123100431 is an apocalyptic number.

123100431 is a deficient number, since it is larger than the sum of its proper divisors (41033481).

123100431 is an equidigital number, since it uses as much as digits as its factorization.

123100431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41033480.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 123100431 is about 11095.0633616938. The cubic root of 123100431 is about 497.4543021753.

Adding to 123100431 its reverse (134001321), we get a palindrome (257101752).

The spelling of 123100431 in words is "one hundred twenty-three million, one hundred thousand, four hundred thirty-one".