123321431 has 4 divisors (see below), whose sum is σ = 123606672. Its totient is φ = 123036192.

The previous prime is 123321361. The next prime is 123321437. The reversal of 123321431 is 134123321.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123321431 is a prime.

It is a super-2 number, since 2×123321431² = 30416350687775522, 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 (123321437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 141971 + ... + 142836.

It is an arithmetic number, because the mean of its divisors is an integer number (30901668).

Almost surely, 2^123321431 is an apocalyptic number.

123321431 is a deficient number, since it is larger than the sum of its proper divisors (285241).

123321431 is an equidigital number, since it uses as much as digits as its factorization.

123321431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 285240.

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

The square root of 123321431 is about 11105.0182800390. The cubic root of 123321431 is about 497.7518144745.

Adding to 123321431 its reverse (134123321), we get a palindrome (257444752).

The spelling of 123321431 in words is "one hundred twenty-three million, three hundred twenty-one thousand, four hundred thirty-one".