6621191 has 2 divisors, whose sum is σ = 6621192. Its totient is φ = 6621190.

The previous prime is 6621163. The next prime is 6621233. The reversal of 6621191 is 1911266.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6621191 - 2⁶ = 6621127 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6621191.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6621151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3310595 + 3310596.

It is an arithmetic number, because the mean of its divisors is an integer number (3310596).

Almost surely, 2^6621191 is an apocalyptic number.

6621191 is a deficient number, since it is larger than the sum of its proper divisors (1).

6621191 is an equidigital number, since it uses as much as digits as its factorization.

6621191 is an evil number, because the sum of its binary digits is even.

The product of its digits is 648, while the sum is 26.

The square root of 6621191 is about 2573.1675032924. The cubic root of 6621191 is about 187.7782866158.

The spelling of 6621191 in words is "six million, six hundred twenty-one thousand, one hundred ninety-one".