6445641 has 4 divisors (see below), whose sum is σ = 8594192. Its totient is φ = 4297092.

The previous prime is 6445639. The next prime is 6445661. The reversal of 6445641 is 1465446.

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 not a de Polignac number, because 6445641 - 2¹ = 6445639 is a prime.

It is a D-number.

It is a Duffinian number.

6445641 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 6445599 and 6445608.

It is not an unprimeable number, because it can be changed into a prime (6445661) 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, 1074271 + ... + 1074276.

It is an arithmetic number, because the mean of its divisors is an integer number (2148548).

Almost surely, 2^6445641 is an apocalyptic number.

It is an amenable number.

6445641 is a deficient number, since it is larger than the sum of its proper divisors (2148551).

6445641 is a wasteful number, since it uses less digits than its factorization.

6445641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2148550.

The product of its digits is 11520, while the sum is 30.

The square root of 6445641 is about 2538.8266975121. The cubic root of 6445641 is about 186.1038557471.

The spelling of 6445641 in words is "six million, four hundred forty-five thousand, six hundred forty-one".