6621697 has 4 divisors (see below), whose sum is σ = 6628356. Its totient is φ = 6615040.

The previous prime is 6621691. The next prime is 6621707. The reversal of 6621697 is 7961266.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 3538161 + 3083536 = 1881^2 + 1756^2 .

It is a cyclic number.

It is not a de Polignac number, because 6621697 - 2¹¹ = 6619649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6621691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1504 + ... + 3937.

It is an arithmetic number, because the mean of its divisors is an integer number (1657089).

Almost surely, 2^6621697 is an apocalyptic number.

It is an amenable number.

6621697 is a deficient number, since it is larger than the sum of its proper divisors (6659).

6621697 is a wasteful number, since it uses less digits than its factorization.

6621697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6658.

The product of its digits is 27216, while the sum is 37.

The square root of 6621697 is about 2573.2658238122. The cubic root of 6621697 is about 187.7830699140.

The spelling of 6621697 in words is "six million, six hundred twenty-one thousand, six hundred ninety-seven".