13217409991 has 2 divisors, whose sum is σ = 13217409992. Its totient is φ = 13217409990.

The previous prime is 13217409979. The next prime is 13217410001. The reversal of 13217409991 is 19990471231.

It is a strong prime.

It is an emirp because it is prime and its reverse (19990471231) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13217409991 - 2²⁷ = 13083192263 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13217409391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6608704995 + 6608704996.

It is an arithmetic number, because the mean of its divisors is an integer number (6608704996).

Almost surely, 2^13217409991 is an apocalyptic number.

13217409991 is a deficient number, since it is larger than the sum of its proper divisors (1).

13217409991 is an equidigital number, since it uses as much as digits as its factorization.

13217409991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 122472, while the sum is 46.

The spelling of 13217409991 in words is "thirteen billion, two hundred seventeen million, four hundred nine thousand, nine hundred ninety-one".