210001201649 has 2 divisors, whose sum is σ = 210001201650. Its totient is φ = 210001201648.

The previous prime is 210001201643. The next prime is 210001201681. The reversal of 210001201649 is 946102100012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 139427560000 + 70573641649 = 373400^2 + 265657^2 .

It is a cyclic number.

It is not a de Polignac number, because 210001201649 - 2⁴ = 210001201633 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (210001201643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105000600824 + 105000600825.

It is an arithmetic number, because the mean of its divisors is an integer number (105000600825).

Almost surely, 2^210001201649 is an apocalyptic number.

It is an amenable number.

210001201649 is a deficient number, since it is larger than the sum of its proper divisors (1).

210001201649 is an equidigital number, since it uses as much as digits as its factorization.

210001201649 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 26.

The spelling of 210001201649 in words is "two hundred ten billion, one million, two hundred one thousand, six hundred forty-nine".