6445861 has 4 divisors (see below), whose sum is σ = 6653824. Its totient is φ = 6237900.

The previous prime is 6445853. The next prime is 6445871. The reversal of 6445861 is 1685446.

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 6445861 - 2³ = 6445853 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6445811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 103935 + ... + 103996.

It is an arithmetic number, because the mean of its divisors is an integer number (1663456).

Almost surely, 2^6445861 is an apocalyptic number.

It is an amenable number.

6445861 is a deficient number, since it is larger than the sum of its proper divisors (207963).

6445861 is a wasteful number, since it uses less digits than its factorization.

6445861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207962.

The product of its digits is 23040, while the sum is 34.

The square root of 6445861 is about 2538.8700242431. The cubic root of 6445861 is about 186.1059730634.

The spelling of 6445861 in words is "six million, four hundred forty-five thousand, eight hundred sixty-one".