13215539 has 2 divisors, whose sum is σ = 13215540. Its totient is φ = 13215538.

The previous prime is 13215533. The next prime is 13215541. The reversal of 13215539 is 93551231.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 13215539 - 2¹⁶ = 13150003 is a prime.

It is a Sophie Germain prime.

Together with 13215541, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (13215533) 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 as a sum of consecutive naturals, namely, 6607769 + 6607770.

It is an arithmetic number, because the mean of its divisors is an integer number (6607770).

Almost surely, 2^13215539 is an apocalyptic number.

13215539 is a deficient number, since it is larger than the sum of its proper divisors (1).

13215539 is an equidigital number, since it uses as much as digits as its factorization.

13215539 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4050, while the sum is 29.

The square root of 13215539 is about 3635.3182804261. The cubic root of 13215539 is about 236.4258506168.

The spelling of 13215539 in words is "thirteen million, two hundred fifteen thousand, five hundred thirty-nine".