13005649 has 4 divisors (see below), whose sum is σ = 13571136. Its totient is φ = 12440164.

The previous prime is 13005637. The next prime is 13005673. The reversal of 13005649 is 94650031.

13005649 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 13005649 - 2⁷ = 13005521 is a prime.

It is a super-2 number, since 2×13005649² = 338293811822402, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13005679) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 282709 + ... + 282754.

It is an arithmetic number, because the mean of its divisors is an integer number (3392784).

Almost surely, 2^13005649 is an apocalyptic number.

It is an amenable number.

13005649 is a deficient number, since it is larger than the sum of its proper divisors (565487).

13005649 is an equidigital number, since it uses as much as digits as its factorization.

13005649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 565486.

The product of its (nonzero) digits is 3240, while the sum is 28.

The square root of 13005649 is about 3606.3345657329. The cubic root of 13005649 is about 235.1675220187.

The spelling of 13005649 in words is "thirteen million, five thousand, six hundred forty-nine".