6221645 has 16 divisors (see below), whose sum is σ = 7968000. Its totient is φ = 4650048.

The previous prime is 6221639. The next prime is 6221647. The reversal of 6221645 is 5461226.

6221645 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 6221645 - 2⁴ = 6221629 is a prime.

It is a super-3 number, since 3×6221645³ (a number of 21 digits) contains 333 as substring.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6221647) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7091 + ... + 7919.

It is an arithmetic number, because the mean of its divisors is an integer number (498000).

Almost surely, 2^6221645 is an apocalyptic number.

It is an amenable number.

6221645 is a deficient number, since it is larger than the sum of its proper divisors (1746355).

6221645 is a wasteful number, since it uses less digits than its factorization.

6221645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 932.

The product of its digits is 2880, while the sum is 26.

The square root of 6221645 is about 2494.3225533198. The cubic root of 6221645 is about 183.9225907054.

The spelling of 6221645 in words is "six million, two hundred twenty-one thousand, six hundred forty-five".