649341191 has 2 divisors, whose sum is σ = 649341192. Its totient is φ = 649341190.

The previous prime is 649341181. The next prime is 649341247. The reversal of 649341191 is 191143946.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-649341191 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (649341101) by changing a digit.

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

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324670595 + 324670596.

It is an arithmetic number, because the mean of its divisors is an integer number (324670596).

Almost surely, 2^649341191 is an apocalyptic number.

649341191 is a deficient number, since it is larger than the sum of its proper divisors (1).

649341191 is an equidigital number, since it uses as much as digits as its factorization.

649341191 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23328, while the sum is 38.

The square root of 649341191 is about 25482.1739849645. The cubic root of 649341191 is about 865.9463468619.

The spelling of 649341191 in words is "six hundred forty-nine million, three hundred forty-one thousand, one hundred ninety-one".