6221905 has 4 divisors (see below), whose sum is σ = 7466292. Its totient is φ = 4977520.

The previous prime is 6221879. The next prime is 6221909. The reversal of 6221905 is 5091226.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4822416 + 1399489 = 2196^2 + 1183^2 .

It is not a de Polignac number, because 6221905 - 2¹⁵ = 6189137 is a prime.

It is a Duffinian number.

6221905 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 6221905.

It is not an unprimeable number, because it can be changed into a prime (6221909) 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, 622186 + ... + 622195.

It is an arithmetic number, because the mean of its divisors is an integer number (1866573).

Almost surely, 2^6221905 is an apocalyptic number.

It is an amenable number.

6221905 is a deficient number, since it is larger than the sum of its proper divisors (1244387).

6221905 is a wasteful number, since it uses less digits than its factorization.

6221905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1244386.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 6221905 is about 2494.3746711350. The cubic root of 6221905 is about 183.9251526864.

The spelling of 6221905 in words is "six million, two hundred twenty-one thousand, nine hundred five".