13499509843 has 4 divisors (see below), whose sum is σ = 13508763880. Its totient is φ = 13490255808.

The previous prime is 13499509769. The next prime is 13499509879. The reversal of 13499509843 is 34890599431.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34890599431 = 56893 ⋅613267.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13499509843 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13499509043) 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, 4624830 + ... + 4627747.

It is an arithmetic number, because the mean of its divisors is an integer number (3377190970).

Almost surely, 2^13499509843 is an apocalyptic number.

13499509843 is a deficient number, since it is larger than the sum of its proper divisors (9254037).

13499509843 is an equidigital number, since it uses as much as digits as its factorization.

13499509843 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9254036.

The product of its (nonzero) digits is 4199040, while the sum is 55.

The spelling of 13499509843 in words is "thirteen billion, four hundred ninety-nine million, five hundred nine thousand, eight hundred forty-three".