6613945 has 16 divisors (see below), whose sum is σ = 8643600. Its totient is φ = 4829184.

The previous prime is 6613931. The next prime is 6613973. The reversal of 6613945 is 5493166.

It can be written as a sum of positive squares in 8 ways, for example, as 19321 + 6594624 = 139^2 + 2568^2 .

It is a cyclic number.

It is not a de Polignac number, because 6613945 - 2⁵ = 6613913 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6613945.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5781 + ... + 6829.

It is an arithmetic number, because the mean of its divisors is an integer number (540225).

Almost surely, 2^6613945 is an apocalyptic number.

6613945 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

6613945 is a deficient number, since it is larger than the sum of its proper divisors (2029655).

6613945 is a wasteful number, since it uses less digits than its factorization.

6613945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1164.

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

The square root of 6613945 is about 2571.7591255792. The cubic root of 6613945 is about 187.7097622817.

The spelling of 6613945 in words is "six million, six hundred thirteen thousand, nine hundred forty-five".