1001201212909 has 2 divisors, whose sum is σ = 1001201212910. Its totient is φ = 1001201212908.

The previous prime is 1001201212877. The next prime is 1001201212993. The reversal of 1001201212909 is 9092121021001.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 991518062500 + 9683150409 = 995750^2 + 98403^2 .

It is a cyclic number.

It is not a de Polignac number, because 1001201212909 - 2⁵ = 1001201212877 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1001201212309) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500600606454 + 500600606455.

It is an arithmetic number, because the mean of its divisors is an integer number (500600606455).

Almost surely, 2^{1001201212909} is an apocalyptic number.

It is an amenable number.

1001201212909 is a deficient number, since it is larger than the sum of its proper divisors (1).

1001201212909 is an equidigital number, since it uses as much as digits as its factorization.

1001201212909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 28.

The spelling of 1001201212909 in words is "one trillion, one billion, two hundred one million, two hundred twelve thousand, nine hundred nine".