9892712861 has 2 divisors, whose sum is σ = 9892712862. Its totient is φ = 9892712860.

The previous prime is 9892712857. The next prime is 9892712897. The reversal of 9892712861 is 1682172989.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7633516900 + 2259195961 = 87370^2 + 47531^2 .

It is a cyclic number.

It is not a de Polignac number, because 9892712861 - 2² = 9892712857 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9892712801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4946356430 + 4946356431.

It is an arithmetic number, because the mean of its divisors is an integer number (4946356431).

Almost surely, 2^9892712861 is an apocalyptic number.

It is an amenable number.

9892712861 is a deficient number, since it is larger than the sum of its proper divisors (1).

9892712861 is an equidigital number, since it uses as much as digits as its factorization.

9892712861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 870912, while the sum is 53.

The square root of 9892712861 is about 99462.1177182549. The cubic root of 9892712861 is about 2146.7021993843.

The spelling of 9892712861 in words is "nine billion, eight hundred ninety-two million, seven hundred twelve thousand, eight hundred sixty-one".