123534431 has 4 divisors (see below), whose sum is σ = 124047264. Its totient is φ = 123021600.

The previous prime is 123534421. The next prime is 123534479. The reversal of 123534431 is 134435321.

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-123534431 is a prime.

It is a super-2 number, since 2×123534431² = 30521511284987522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 123534431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123534401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 256055 + ... + 256536.

It is an arithmetic number, because the mean of its divisors is an integer number (31011816).

Almost surely, 2^123534431 is an apocalyptic number.

123534431 is a deficient number, since it is larger than the sum of its proper divisors (512833).

123534431 is an equidigital number, since it uses as much as digits as its factorization.

123534431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 512832.

The product of its digits is 4320, while the sum is 26.

The square root of 123534431 is about 11114.6044014171. The cubic root of 123534431 is about 498.0382209124.

Adding to 123534431 its reverse (134435321), we get a palindrome (257969752).

The spelling of 123534431 in words is "one hundred twenty-three million, five hundred thirty-four thousand, four hundred thirty-one".