13000649 has 4 divisors (see below), whose sum is σ = 13317780. Its totient is φ = 12683520.

The previous prime is 13000633. The next prime is 13000651. The reversal of 13000649 is 94600031.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 525625 + 12475024 = 725^2 + 3532^2 .

It is a cyclic number.

It is not a de Polignac number, because 13000649 - 2⁴ = 13000633 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (13000679) 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, 158504 + ... + 158585.

It is an arithmetic number, because the mean of its divisors is an integer number (3329445).

Almost surely, 2^13000649 is an apocalyptic number.

It is an amenable number.

13000649 is a deficient number, since it is larger than the sum of its proper divisors (317131).

13000649 is an equidigital number, since it uses as much as digits as its factorization.

13000649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 317130.

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 13000649 is about 3605.6412744476. The cubic root of 13000649 is about 235.1373815690.

The spelling of 13000649 in words is "thirteen million, six hundred forty-nine", and thus it is an aban number.