13639811 has 2 divisors, whose sum is σ = 13639812. Its totient is φ = 13639810.

The previous prime is 13639807. The next prime is 13639819. The reversal of 13639811 is 11893631.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 13639811 - 2² = 13639807 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (13639819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6819905 + 6819906.

It is an arithmetic number, because the mean of its divisors is an integer number (6819906).

Almost surely, 2^13639811 is an apocalyptic number.

13639811 is a deficient number, since it is larger than the sum of its proper divisors (1).

13639811 is an equidigital number, since it uses as much as digits as its factorization.

13639811 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3888, while the sum is 32.

The square root of 13639811 is about 3693.2114751257. The cubic root of 13639811 is about 238.9293220746.

The spelling of 13639811 in words is "thirteen million, six hundred thirty-nine thousand, eight hundred eleven".