13515690049 has 3 divisors (see below), whose sum is σ = 13515806307. Its totient is φ = 13515573792.

The previous prime is 13515690017. The next prime is 13515690053. The reversal of 13515690049 is 94009651531.

The square root of 13515690049 is 116257.

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

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., 1554330625 + 11961359424 = 39425^2 + 109368^2 .

It is not a de Polignac number, because 13515690049 - 2⁵ = 13515690017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13515689987 and 13515690014.

It is not an unprimeable number, because it can be changed into a prime (13515690449) 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, 58129 + ... + 174385.

It is an arithmetic number, because the mean of its divisors is an integer number (4505268769).

Almost surely, 2^13515690049 is an apocalyptic number.

13515690049 is the 116257-th square number.

13515690049 is the 58129-th centered octagonal number.

It is an amenable number.

13515690049 is a deficient number, since it is larger than the sum of its proper divisors (116258).

13515690049 is an frugal number, since it uses more digits than its factorization.

13515690049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 232514 (or 116257 counting only the distinct ones).

The product of its (nonzero) digits is 145800, while the sum is 43.

The spelling of 13515690049 in words is "thirteen billion, five hundred fifteen million, six hundred ninety thousand, forty-nine".