20101201709 has 2 divisors, whose sum is σ = 20101201710. Its totient is φ = 20101201708.

The previous prime is 20101201697. The next prime is 20101201741. The reversal of 20101201709 is 90710210102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19936592809 + 164608900 = 141197^2 + 12830^2 .

It is a cyclic number.

It is not a de Polignac number, because 20101201709 - 2¹⁶ = 20101136173 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20101201609) 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, 10050600854 + 10050600855.

It is an arithmetic number, because the mean of its divisors is an integer number (10050600855).

Almost surely, 2^20101201709 is an apocalyptic number.

It is an amenable number.

20101201709 is a deficient number, since it is larger than the sum of its proper divisors (1).

20101201709 is an equidigital number, since it uses as much as digits as its factorization.

20101201709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 252, while the sum is 23.

The spelling of 20101201709 in words is "twenty billion, one hundred one million, two hundred one thousand, seven hundred nine".