13657649 has 2 divisors, whose sum is σ = 13657650. Its totient is φ = 13657648.

The previous prime is 13657621. The next prime is 13657669. The reversal of 13657649 is 94675631.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13653025 + 4624 = 3695^2 + 68^2 .

It is a cyclic number.

It is not a de Polignac number, because 13657649 - 2²⁰ = 12609073 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (13657619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6828824 + 6828825.

It is an arithmetic number, because the mean of its divisors is an integer number (6828825).

Almost surely, 2^13657649 is an apocalyptic number.

It is an amenable number.

13657649 is a deficient number, since it is larger than the sum of its proper divisors (1).

13657649 is an equidigital number, since it uses as much as digits as its factorization.

13657649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 136080, while the sum is 41.

The square root of 13657649 is about 3695.6256574496. The cubic root of 13657649 is about 239.0334331129.

The spelling of 13657649 in words is "thirteen million, six hundred fifty-seven thousand, six hundred forty-nine".