199142861 has 2 divisors, whose sum is σ = 199142862. Its totient is φ = 199142860.

The previous prime is 199142851. The next prime is 199142869. The reversal of 199142861 is 168241991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 134420836 + 64722025 = 11594^2 + 8045^2 .

It is a cyclic number.

It is not a de Polignac number, because 199142861 - 2¹⁰ = 199141837 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (199142869) 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, 99571430 + 99571431.

It is an arithmetic number, because the mean of its divisors is an integer number (99571431).

Almost surely, 2^199142861 is an apocalyptic number.

It is an amenable number.

199142861 is a deficient number, since it is larger than the sum of its proper divisors (1).

199142861 is an equidigital number, since it uses as much as digits as its factorization.

199142861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31104, while the sum is 41.

The square root of 199142861 is about 14111.7986451054. The cubic root of 199142861 is about 583.9669214469.

The spelling of 199142861 in words is "one hundred ninety-nine million, one hundred forty-two thousand, eight hundred sixty-one".