649121903 has 2 divisors, whose sum is σ = 649121904. Its totient is φ = 649121902.

The previous prime is 649121873. The next prime is 649121933. The reversal of 649121903 is 309121946.

649121903 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a balanced prime because it is at equal distance from previous prime (649121873) and next prime (649121933).

It is a cyclic number.

It is not a de Polignac number, because 649121903 - 2⁶ = 649121839 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 (649121933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324560951 + 324560952.

It is an arithmetic number, because the mean of its divisors is an integer number (324560952).

Almost surely, 2^649121903 is an apocalyptic number.

649121903 is a deficient number, since it is larger than the sum of its proper divisors (1).

649121903 is an equidigital number, since it uses as much as digits as its factorization.

649121903 is an odious number, because the sum of its binary digits is odd.

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

The square root of 649121903 is about 25477.8708490329. The cubic root of 649121903 is about 865.8488567569.

The spelling of 649121903 in words is "six hundred forty-nine million, one hundred twenty-one thousand, nine hundred three".