20101202309 has 2 divisors, whose sum is σ = 20101202310. Its totient is φ = 20101202308.

The previous prime is 20101202299. The next prime is 20101202347. The reversal of 20101202309 is 90320210102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19959473284 + 141729025 = 141278^2 + 11905^2 .

It is a cyclic number.

It is not a de Polignac number, because 20101202309 - 2⁸ = 20101202053 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20101252309) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10050601154 + 10050601155.

It is an arithmetic number, because the mean of its divisors is an integer number (10050601155).

Almost surely, 2^20101202309 is an apocalyptic number.

It is an amenable number.

20101202309 is a deficient number, since it is larger than the sum of its proper divisors (1).

20101202309 is an equidigital number, since it uses as much as digits as its factorization.

20101202309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 20.

The spelling of 20101202309 in words is "twenty billion, one hundred one million, two hundred two thousand, three hundred nine".