13917805991 has 2 divisors, whose sum is σ = 13917805992. Its totient is φ = 13917805990.

The previous prime is 13917805969. The next prime is 13917806017. The reversal of 13917805991 is 19950871931.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 13917805991 - 2¹⁸ = 13917543847 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13917805901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6958902995 + 6958902996.

It is an arithmetic number, because the mean of its divisors is an integer number (6958902996).

Almost surely, 2^13917805991 is an apocalyptic number.

13917805991 is a deficient number, since it is larger than the sum of its proper divisors (1).

13917805991 is an equidigital number, since it uses as much as digits as its factorization.

13917805991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 612360, while the sum is 53.

The spelling of 13917805991 in words is "thirteen billion, nine hundred seventeen million, eight hundred five thousand, nine hundred ninety-one".