6650191 has 4 divisors (see below), whose sum is σ = 6694384. Its totient is φ = 6606000.

The previous prime is 6650153. The next prime is 6650207. The reversal of 6650191 is 1910566.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 6650191 - 2¹¹ = 6648143 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6650131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21870 + ... + 22171.

It is an arithmetic number, because the mean of its divisors is an integer number (1673596).

Almost surely, 2^6650191 is an apocalyptic number.

6650191 is a deficient number, since it is larger than the sum of its proper divisors (44193).

6650191 is a wasteful number, since it uses less digits than its factorization.

6650191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44192.

The product of its (nonzero) digits is 1620, while the sum is 28.

The square root of 6650191 is about 2578.7964246912. The cubic root of 6650191 is about 188.0520359202.

The spelling of 6650191 in words is "six million, six hundred fifty thousand, one hundred ninety-one".