13205310431 has 4 divisors (see below), whose sum is σ = 13205628672. Its totient is φ = 13204992192.

The previous prime is 13205310427. The next prime is 13205310499. The reversal of 13205310431 is 13401350231.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13401350231 = 947 ⋅14151373.

It is a cyclic number.

It is not a de Polignac number, because 13205310431 - 2² = 13205310427 is a prime.

It is a super-2 number, since 2×13205310431² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13205310397 and 13205310406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13205310401) 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, 85535 + ... + 183648.

It is an arithmetic number, because the mean of its divisors is an integer number (3301407168).

Almost surely, 2^13205310431 is an apocalyptic number.

13205310431 is a deficient number, since it is larger than the sum of its proper divisors (318241).

13205310431 is an equidigital number, since it uses as much as digits as its factorization.

13205310431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 318240.

The product of its (nonzero) digits is 1080, while the sum is 23.

Adding to 13205310431 its reverse (13401350231), we get a palindrome (26606660662).

The spelling of 13205310431 in words is "thirteen billion, two hundred five million, three hundred ten thousand, four hundred thirty-one".