649958791 has 2 divisors, whose sum is σ = 649958792. Its totient is φ = 649958790.

The previous prime is 649958753. The next prime is 649958797. The reversal of 649958791 is 197859946.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 649958791 - 2⁹ = 649958279 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (649958797) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324979395 + 324979396.

It is an arithmetic number, because the mean of its divisors is an integer number (324979396).

Almost surely, 2^649958791 is an apocalyptic number.

649958791 is a deficient number, since it is larger than the sum of its proper divisors (1).

649958791 is an equidigital number, since it uses as much as digits as its factorization.

649958791 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4898880, while the sum is 58.

The square root of 649958791 is about 25494.2893801730. The cubic root of 649958791 is about 866.2207988785.

The spelling of 649958791 in words is "six hundred forty-nine million, nine hundred fifty-eight thousand, seven hundred ninety-one".