13099991 has 2 divisors, whose sum is σ = 13099992. Its totient is φ = 13099990.

The previous prime is 13099937. The next prime is 13100023. The reversal of 13099991 is 19999031.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 13099991 - 2⁶ = 13099927 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13099901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6549995 + 6549996.

It is an arithmetic number, because the mean of its divisors is an integer number (6549996).

Almost surely, 2^13099991 is an apocalyptic number.

13099991 is a deficient number, since it is larger than the sum of its proper divisors (1).

13099991 is an equidigital number, since it uses as much as digits as its factorization.

13099991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19683, while the sum is 41.

The square root of 13099991 is about 3619.3909708679. The cubic root of 13099991 is about 235.7347817763.

The spelling of 13099991 in words is "thirteen million, ninety-nine thousand, nine hundred ninety-one".