13251321431 has 4 divisors (see below), whose sum is σ = 13252437072. Its totient is φ = 13250205792.

The previous prime is 13251321389. The next prime is 13251321437. The reversal of 13251321431 is 13412315231.

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 13251321431 - 2⁶ = 13251321367 is a prime.

It is a super-2 number, since 2×13251321431² (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 13251321431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13251321437) 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, 539810 + ... + 563823.

It is an arithmetic number, because the mean of its divisors is an integer number (3313109268).

Almost surely, 2^13251321431 is an apocalyptic number.

13251321431 is a deficient number, since it is larger than the sum of its proper divisors (1115641).

13251321431 is a wasteful number, since it uses less digits than its factorization.

13251321431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1115640.

The product of its digits is 2160, while the sum is 26.

Adding to 13251321431 its reverse (13412315231), we get a palindrome (26663636662).

The spelling of 13251321431 in words is "thirteen billion, two hundred fifty-one million, three hundred twenty-one thousand, four hundred thirty-one".