13664071 has 2 divisors, whose sum is σ = 13664072. Its totient is φ = 13664070.

The previous prime is 13664069. The next prime is 13664129. The reversal of 13664071 is 17046631.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 13664071 - 2¹ = 13664069 is a prime.

Together with 13664069, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13664471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6832035 + 6832036.

It is an arithmetic number, because the mean of its divisors is an integer number (6832036).

Almost surely, 2^13664071 is an apocalyptic number.

13664071 is a deficient number, since it is larger than the sum of its proper divisors (1).

13664071 is an equidigital number, since it uses as much as digits as its factorization.

13664071 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 13664071 is about 3696.4944203935. The cubic root of 13664071 is about 239.0708927607.

The spelling of 13664071 in words is "thirteen million, six hundred sixty-four thousand, seventy-one".