15817000861 has 2 divisors, whose sum is σ = 15817000862. Its totient is φ = 15817000860.

The previous prime is 15817000819. The next prime is 15817000873. The reversal of 15817000861 is 16800071851.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12926325636 + 2890675225 = 113694^2 + 53765^2 .

It is a cyclic number.

It is not a de Polignac number, because 15817000861 - 2⁹ = 15817000349 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 15817000861.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15817000811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7908500430 + 7908500431.

It is an arithmetic number, because the mean of its divisors is an integer number (7908500431).

Almost surely, 2^15817000861 is an apocalyptic number.

It is an amenable number.

15817000861 is a deficient number, since it is larger than the sum of its proper divisors (1).

15817000861 is an equidigital number, since it uses as much as digits as its factorization.

15817000861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13440, while the sum is 37.

The spelling of 15817000861 in words is "fifteen billion, eight hundred seventeen million, eight hundred sixty-one", and thus it is an aban number.