6195991 has 2 divisors, whose sum is σ = 6195992. Its totient is φ = 6195990.

The previous prime is 6195971. The next prime is 6195997. The reversal of 6195991 is 1995916.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6195991 - 2⁷ = 6195863 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6195997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3097995 + 3097996.

It is an arithmetic number, because the mean of its divisors is an integer number (3097996).

Almost surely, 2^6195991 is an apocalyptic number.

6195991 is a deficient number, since it is larger than the sum of its proper divisors (1).

6195991 is an equidigital number, since it uses as much as digits as its factorization.

6195991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21870, while the sum is 40.

The square root of 6195991 is about 2489.1747628481. The cubic root of 6195991 is about 183.6694502487.

The spelling of 6195991 in words is "six million, one hundred ninety-five thousand, nine hundred ninety-one".