6621245 has 16 divisors (see below), whose sum is σ = 8557488. Its totient is φ = 4899840.

The previous prime is 6621239. The next prime is 6621281. The reversal of 6621245 is 5421266.

It can be written as a sum of positive squares in 8 ways, for example, as 139129 + 6482116 = 373^2 + 2546^2 .

It is not a de Polignac number, because 6621245 - 2¹⁴ = 6604861 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4547 + ... + 5823.

It is an arithmetic number, because the mean of its divisors is an integer number (534843).

Almost surely, 2^6621245 is an apocalyptic number.

It is an amenable number.

6621245 is a deficient number, since it is larger than the sum of its proper divisors (1936243).

6621245 is a wasteful number, since it uses less digits than its factorization.

6621245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1360.

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

The square root of 6621245 is about 2573.1779961752. The cubic root of 6621245 is about 187.7787970980.

The spelling of 6621245 in words is "six million, six hundred twenty-one thousand, two hundred forty-five".