649055923 has 2 divisors, whose sum is σ = 649055924. Its totient is φ = 649055922.

The previous prime is 649055917. The next prime is 649055951. The reversal of 649055923 is 329550946.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 649055923 - 2²¹ = 646958771 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 649055923.

It is not a weakly prime, because it can be changed into another prime (649055963) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324527961 + 324527962.

It is an arithmetic number, because the mean of its divisors is an integer number (324527962).

Almost surely, 2^649055923 is an apocalyptic number.

649055923 is a deficient number, since it is larger than the sum of its proper divisors (1).

649055923 is an equidigital number, since it uses as much as digits as its factorization.

649055923 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 291600, while the sum is 43.

The square root of 649055923 is about 25476.5759669544. The cubic root of 649055923 is about 865.8195193587.

The spelling of 649055923 in words is "six hundred forty-nine million, fifty-five thousand, nine hundred twenty-three".