13668749 has 2 divisors, whose sum is σ = 13668750. Its totient is φ = 13668748.

The previous prime is 13668727. The next prime is 13668751. The reversal of 13668749 is 94786631.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7739524 + 5929225 = 2782^2 + 2435^2 .

It is a cyclic number.

It is not a de Polignac number, because 13668749 - 2¹² = 13664653 is a prime.

Together with 13668751, it forms a pair of twin primes.

It is a Chen prime.

It is a plaindrome in base 15.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13668719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6834374 + 6834375.

It is an arithmetic number, because the mean of its divisors is an integer number (6834375).

Almost surely, 2^13668749 is an apocalyptic number.

It is an amenable number.

13668749 is a deficient number, since it is larger than the sum of its proper divisors (1).

13668749 is an equidigital number, since it uses as much as digits as its factorization.

13668749 is an evil number, because the sum of its binary digits is even.

The product of its digits is 217728, while the sum is 44.

The square root of 13668749 is about 3697.1271279197. The cubic root of 13668749 is about 239.0981722353.

The spelling of 13668749 in words is "thirteen million, six hundred sixty-eight thousand, seven hundred forty-nine".