13606991 has 2 divisors, whose sum is σ = 13606992. Its totient is φ = 13606990.

The previous prime is 13606973. The next prime is 13606997. The reversal of 13606991 is 19960631.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 13606991 - 2²² = 9412687 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13606997) 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, 6803495 + 6803496.

It is an arithmetic number, because the mean of its divisors is an integer number (6803496).

Almost surely, 2^13606991 is an apocalyptic number.

13606991 is a deficient number, since it is larger than the sum of its proper divisors (1).

13606991 is an equidigital number, since it uses as much as digits as its factorization.

13606991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8748, while the sum is 35.

The square root of 13606991 is about 3688.7655116583. The cubic root of 13606991 is about 238.7375315803.

The spelling of 13606991 in words is "thirteen million, six hundred six thousand, nine hundred ninety-one".