189813829196861 has 2 divisors, whose sum is σ = 189813829196862. Its totient is φ = 189813829196860.

The previous prime is 189813829196807. The next prime is 189813829196881. The reversal of 189813829196861 is 168691928318981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 111287097532900 + 78526731663961 = 10549270^2 + 8861531^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-189813829196861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (189813829196881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94906914598430 + 94906914598431.

It is an arithmetic number, because the mean of its divisors is an integer number (94906914598431).

Almost surely, 2^{189813829196861} is an apocalyptic number.

It is an amenable number.

189813829196861 is a deficient number, since it is larger than the sum of its proper divisors (1).

189813829196861 is an equidigital number, since it uses as much as digits as its factorization.

189813829196861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 644972544, while the sum is 80.

The spelling of 189813829196861 in words is "one hundred eighty-nine trillion, eight hundred thirteen billion, eight hundred twenty-nine million, one hundred ninety-six thousand, eight hundred sixty-one".