6601945 has 16 divisors (see below), whose sum is σ = 9227520. Its totient is φ = 4440384.

The previous prime is 6601927. The next prime is 6601961. The reversal of 6601945 is 5491066.

It is a cyclic number.

It is not a de Polignac number, because 6601945 - 2⁷ = 6601817 is a prime.

It is an Ulam number.

It is an unprimeable number.

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 in 15 ways as a sum of consecutive naturals, for example, 76 + ... + 3634.

It is an arithmetic number, because the mean of its divisors is an integer number (576720).

Almost surely, 2^6601945 is an apocalyptic number.

It is an amenable number.

6601945 is a deficient number, since it is larger than the sum of its proper divisors (2625575).

6601945 is a wasteful number, since it uses less digits than its factorization.

6601945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3624.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 6601945 is about 2569.4250329597. The cubic root of 6601945 is about 187.5961699247.

The spelling of 6601945 in words is "six million, six hundred one thousand, nine hundred forty-five".