13605649 has 2 divisors, whose sum is σ = 13605650. Its totient is φ = 13605648.

The previous prime is 13605629. The next prime is 13605671. The reversal of 13605649 is 94650631.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12852225 + 753424 = 3585^2 + 868^2 .

It is a cyclic number.

It is not a de Polignac number, because 13605649 - 2¹³ = 13597457 is a prime.

It is a super-2 number, since 2×13605649² = 370227369422402, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (13605619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6802824 + 6802825.

It is an arithmetic number, because the mean of its divisors is an integer number (6802825).

Almost surely, 2^13605649 is an apocalyptic number.

It is an amenable number.

13605649 is a deficient number, since it is larger than the sum of its proper divisors (1).

13605649 is an equidigital number, since it uses as much as digits as its factorization.

13605649 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 19440, while the sum is 34.

The square root of 13605649 is about 3688.5836034988. The cubic root of 13605649 is about 238.7296827644.

The spelling of 13605649 in words is "thirteen million, six hundred five thousand, six hundred forty-nine".