649120391 has 2 divisors, whose sum is σ = 649120392. Its totient is φ = 649120390.

The previous prime is 649120379. The next prime is 649120441. The reversal of 649120391 is 193021946.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-649120391 is a 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 (649120291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324560195 + 324560196.

It is an arithmetic number, because the mean of its divisors is an integer number (324560196).

Almost surely, 2^649120391 is an apocalyptic number.

649120391 is a deficient number, since it is larger than the sum of its proper divisors (1).

649120391 is an equidigital number, since it uses as much as digits as its factorization.

649120391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11664, while the sum is 35.

The square root of 649120391 is about 25477.8411762064. The cubic root of 649120391 is about 865.8481844823.

The spelling of 649120391 in words is "six hundred forty-nine million, one hundred twenty thousand, three hundred ninety-one".