13123432331 has 4 divisors (see below), whose sum is σ = 13195937664. Its totient is φ = 13050927000.

The previous prime is 13123432327. The next prime is 13123432339. The reversal of 13123432331 is 13323432131.

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 13123432331 - 2² = 13123432327 is a prime.

It is a super-2 number, since 2×13123432331² (a number of 21 digits) 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 13123432331.

It is not an unprimeable number, because it can be changed into a prime (13123432339) 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, 36252395 + ... + 36252756.

It is an arithmetic number, because the mean of its divisors is an integer number (3298984416).

Almost surely, 2^13123432331 is an apocalyptic number.

13123432331 is a deficient number, since it is larger than the sum of its proper divisors (72505333).

13123432331 is an equidigital number, since it uses as much as digits as its factorization.

13123432331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72505332.

The product of its digits is 3888, while the sum is 26.

Adding to 13123432331 its reverse (13323432131), we get a palindrome (26446864462).

The spelling of 13123432331 in words is "thirteen billion, one hundred twenty-three million, four hundred thirty-two thousand, three hundred thirty-one".