13499723594809 has 3 divisors (see below), whose sum is σ = 13499727269007. Its totient is φ = 13499719920612.

The previous prime is 13499723594789. The next prime is 13499723594839. The reversal of 13499723594809 is 90849532799431.

The square root of 13499723594809 is 3674197.

It is a perfect power (a square), and thus also a powerful number.

13499723594809 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 5870129437225 + 7629594157584 = 2422835^2 + 2762172^2 .

It is not a de Polignac number, because 13499723594809 - 2²⁷ = 13499589377081 is a prime.

It is a super-2 number, since 2×13499723594809² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13499723594839) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 1837099 + ... + 5511295.

It is an arithmetic number, because the mean of its divisors is an integer number (4499909089669).

Almost surely, 2^{13499723594809} is an apocalyptic number.

13499723594809 is the 3674197-th square number.

13499723594809 is the 1837099-th centered octagonal number.

It is an amenable number.

13499723594809 is a deficient number, since it is larger than the sum of its proper divisors (3674198).

13499723594809 is an frugal number, since it uses more digits than its factorization.

13499723594809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7348394 (or 3674197 counting only the distinct ones).

The product of its (nonzero) digits is 529079040, while the sum is 73.

The spelling of 13499723594809 in words is "thirteen trillion, four hundred ninety-nine billion, seven hundred twenty-three million, five hundred ninety-four thousand, eight hundred nine".