13936510809 has 45 divisors (see below), whose sum is σ = 22565732013. Its totient is φ = 8567814528.

The previous prime is 13936510789. The next prime is 13936510813. The reversal of 13936510809 is 90801563931.

The square root of 13936510809 is 118053.

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

It can be written as a sum of positive squares in 4 ways, for example, as 4298769225 + 9637741584 = 65565^2 + 98172^2 .

It is not a de Polignac number, because 13936510809 - 2³³ = 5346576217 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13936510109) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 13811697 + ... + 13812705.

Almost surely, 2^13936510809 is an apocalyptic number.

13936510809 is the 118053-rd square number.

13936510809 is the 59027-th centered octagonal number.

It is an amenable number.

13936510809 is a deficient number, since it is larger than the sum of its proper divisors (8629221204).

13936510809 is an frugal number, since it uses more digits than its factorization.

13936510809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2056 (or 1025 counting only the distinct ones).

The product of its (nonzero) digits is 174960, while the sum is 45.

The spelling of 13936510809 in words is "thirteen billion, nine hundred thirty-six million, five hundred ten thousand, eight hundred nine".