13664237 has 2 divisors, whose sum is σ = 13664238. Its totient is φ = 13664236.

The previous prime is 13664227. The next prime is 13664251. The reversal of 13664237 is 73246631.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8916196 + 4748041 = 2986^2 + 2179^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13664237 is a prime.

It is a super-2 number, since 2×13664237² = 373422745584338, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13664227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6832118 + 6832119.

It is an arithmetic number, because the mean of its divisors is an integer number (6832119).

Almost surely, 2^13664237 is an apocalyptic number.

It is an amenable number.

13664237 is a deficient number, since it is larger than the sum of its proper divisors (1).

13664237 is an equidigital number, since it uses as much as digits as its factorization.

13664237 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18144, while the sum is 32.

The square root of 13664237 is about 3696.5168740316. The cubic root of 13664237 is about 239.0718608862.

The spelling of 13664237 in words is "thirteen million, six hundred sixty-four thousand, two hundred thirty-seven".