13505504431 has 4 divisors (see below), whose sum is σ = 13707079192. Its totient is φ = 13303929672.

The previous prime is 13505504417. The next prime is 13505504459. The reversal of 13505504431 is 13440550531.

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 13505504431 - 2¹⁵ = 13505471663 is a prime.

It is a super-2 number, since 2×13505504431² (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 = 13505504393 and 13505504402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13505504401) 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, 100787280 + ... + 100787413.

It is an arithmetic number, because the mean of its divisors is an integer number (3426769798).

Almost surely, 2^13505504431 is an apocalyptic number.

13505504431 is a deficient number, since it is larger than the sum of its proper divisors (201574761).

13505504431 is an equidigital number, since it uses as much as digits as its factorization.

13505504431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201574760.

The product of its (nonzero) digits is 18000, while the sum is 31.

The spelling of 13505504431 in words is "thirteen billion, five hundred five million, five hundred four thousand, four hundred thirty-one".