6221195891 has 4 divisors (see below), whose sum is σ = 6245981784. Its totient is φ = 6196410000.

The previous prime is 6221195887. The next prime is 6221195927. The reversal of 6221195891 is 1985911226.

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 6221195891 - 2² = 6221195887 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6221195881) 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, 12392570 + ... + 12393071.

It is an arithmetic number, because the mean of its divisors is an integer number (1561495446).

Almost surely, 2^6221195891 is an apocalyptic number.

6221195891 is a deficient number, since it is larger than the sum of its proper divisors (24785893).

6221195891 is a wasteful number, since it uses less digits than its factorization.

6221195891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24785892.

The product of its digits is 77760, while the sum is 44.

The square root of 6221195891 is about 78874.5579448785. The cubic root of 6221195891 is about 1839.1816511926.

The spelling of 6221195891 in words is "six billion, two hundred twenty-one million, one hundred ninety-five thousand, eight hundred ninety-one".