649075121 has 2 divisors, whose sum is σ = 649075122. Its totient is φ = 649075120.

The previous prime is 649075073. The next prime is 649075151. The reversal of 649075121 is 121570946.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 496799521 + 152275600 = 22289^2 + 12340^2 .

It is a cyclic number.

It is not a de Polignac number, because 649075121 - 2¹⁴ = 649058737 is a prime.

It is not a weakly prime, because it can be changed into another prime (649075151) 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, 324537560 + 324537561.

It is an arithmetic number, because the mean of its divisors is an integer number (324537561).

Almost surely, 2^649075121 is an apocalyptic number.

It is an amenable number.

649075121 is a deficient number, since it is larger than the sum of its proper divisors (1).

649075121 is an equidigital number, since it uses as much as digits as its factorization.

649075121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15120, while the sum is 35.

The square root of 649075121 is about 25476.9527416448. The cubic root of 649075121 is about 865.8280557774.

The spelling of 649075121 in words is "six hundred forty-nine million, seventy-five thousand, one hundred twenty-one".