13431213431 has 4 divisors (see below), whose sum is σ = 13431847632. Its totient is φ = 13430579232.

The previous prime is 13431213427. The next prime is 13431213461.

13431213431 is nontrivially palindromic in base 10.

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 13431213431 - 2² = 13431213427 is a prime.

It is a super-2 number, since 2×13431213431² (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 13431213431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13431213461) 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, 284195 + ... + 328068.

It is an arithmetic number, because the mean of its divisors is an integer number (3357961908).

Almost surely, 2^13431213431 is an apocalyptic number.

13431213431 is a deficient number, since it is larger than the sum of its proper divisors (634201).

13431213431 is an equidigital number, since it uses as much as digits as its factorization.

13431213431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 634200.

The product of its digits is 2592, while the sum is 26.

The spelling of 13431213431 in words is "thirteen billion, four hundred thirty-one million, two hundred thirteen thousand, four hundred thirty-one".