992120861 has 2 divisors, whose sum is σ = 992120862. Its totient is φ = 992120860.

The previous prime is 992120839. The next prime is 992120863. The reversal of 992120861 is 168021299.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 986336836 + 5784025 = 31406^2 + 2405^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-992120861 is a prime.

Together with 992120863, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (992120863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 496060430 + 496060431.

It is an arithmetic number, because the mean of its divisors is an integer number (496060431).

Almost surely, 2^992120861 is an apocalyptic number.

It is an amenable number.

992120861 is a deficient number, since it is larger than the sum of its proper divisors (1).

992120861 is an equidigital number, since it uses as much as digits as its factorization.

992120861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15552, while the sum is 38.

The square root of 992120861 is about 31497.9501079038. The cubic root of 992120861 is about 997.3666921096.

The spelling of 992120861 in words is "nine hundred ninety-two million, one hundred twenty thousand, eight hundred sixty-one".