6445913 has 4 divisors (see below), whose sum is σ = 6567588. Its totient is φ = 6324240.

The previous prime is 6445871. The next prime is 6445919. The reversal of 6445913 is 3195446.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3195446 = 2 ⋅1597723.

It can be written as a sum of positive squares in 2 ways, for example, as 2866249 + 3579664 = 1693^2 + 1892^2 .

It is a cyclic number.

It is not a de Polignac number, because 6445913 - 2⁶ = 6445849 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6445913.

It is not an unprimeable number, because it can be changed into a prime (6445919) 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, 60758 + ... + 60863.

It is an arithmetic number, because the mean of its divisors is an integer number (1641897).

Almost surely, 2^6445913 is an apocalyptic number.

It is an amenable number.

6445913 is a deficient number, since it is larger than the sum of its proper divisors (121675).

6445913 is a wasteful number, since it uses less digits than its factorization.

6445913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121674.

The product of its digits is 12960, while the sum is 32.

The square root of 6445913 is about 2538.8802649987. The cubic root of 6445913 is about 186.1064735130.

The spelling of 6445913 in words is "six million, four hundred forty-five thousand, nine hundred thirteen".