13515256211 has 2 divisors, whose sum is σ = 13515256212. Its totient is φ = 13515256210.

The previous prime is 13515256177. The next prime is 13515256231. The reversal of 13515256211 is 11265251531.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13515256211 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (13515256231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6757628105 + 6757628106.

It is an arithmetic number, because the mean of its divisors is an integer number (6757628106).

Almost surely, 2^13515256211 is an apocalyptic number.

13515256211 is a deficient number, since it is larger than the sum of its proper divisors (1).

13515256211 is an equidigital number, since it uses as much as digits as its factorization.

13515256211 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9000, while the sum is 32.

The spelling of 13515256211 in words is "thirteen billion, five hundred fifteen million, two hundred fifty-six thousand, two hundred eleven".