13915513 has 4 divisors (see below), whose sum is σ = 13927540. Its totient is φ = 13903488.

The previous prime is 13915487. The next prime is 13915519. The reversal of 13915513 is 31551931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31551931 = 2017 ⋅15643.

It can be written as a sum of positive squares in 2 ways, for example, as 12766329 + 1149184 = 3573^2 + 1072^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13915513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13915519) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4068 + ... + 6661.

It is an arithmetic number, because the mean of its divisors is an integer number (3481885).

Almost surely, 2^13915513 is an apocalyptic number.

It is an amenable number.

13915513 is a deficient number, since it is larger than the sum of its proper divisors (12027).

13915513 is a wasteful number, since it uses less digits than its factorization.

13915513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12026.

The product of its digits is 2025, while the sum is 28.

The square root of 13915513 is about 3730.3502516520. The cubic root of 13915513 is about 240.5284247966.

The spelling of 13915513 in words is "thirteen million, nine hundred fifteen thousand, five hundred thirteen".