6620191 has 8 divisors (see below), whose sum is σ = 7053264. Its totient is φ = 6192000.

The previous prime is 6620183. The next prime is 6620209. The reversal of 6620191 is 1910266.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6620191 - 2³ = 6620183 is a prime.

It is a Duffinian number.

6620191 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6620101) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1816 + ... + 4066.

It is an arithmetic number, because the mean of its divisors is an integer number (881658).

Almost surely, 2^6620191 is an apocalyptic number.

6620191 is a deficient number, since it is larger than the sum of its proper divisors (433073).

6620191 is a wasteful number, since it uses less digits than its factorization.

6620191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2441.

The product of its (nonzero) digits is 648, while the sum is 25.

The square root of 6620191 is about 2572.9731829150. The cubic root of 6620191 is about 187.7688327406.

The spelling of 6620191 in words is "six million, six hundred twenty thousand, one hundred ninety-one".