889190221861 has 2 divisors, whose sum is σ = 889190221862. Its totient is φ = 889190221860.

The previous prime is 889190221819. The next prime is 889190221901. The reversal of 889190221861 is 168122091988.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 827899812100 + 61290409761 = 909890^2 + 247569^2 .

It is a cyclic number.

It is not a de Polignac number, because 889190221861 - 2²¹ = 889188124709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (889190221561) 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, 444595110930 + 444595110931.

It is an arithmetic number, because the mean of its divisors is an integer number (444595110931).

Almost surely, 2^889190221861 is an apocalyptic number.

It is an amenable number.

889190221861 is a deficient number, since it is larger than the sum of its proper divisors (1).

889190221861 is an equidigital number, since it uses as much as digits as its factorization.

889190221861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 995328, while the sum is 55.

The spelling of 889190221861 in words is "eight hundred eighty-nine billion, one hundred ninety million, two hundred twenty-one thousand, eight hundred sixty-one".