819895741081 has 2 divisors, whose sum is σ = 819895741082. Its totient is φ = 819895741080.

The previous prime is 819895741013. The next prime is 819895741109. The reversal of 819895741081 is 180147598918.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 731864851081 + 88030890000 = 855491^2 + 296700^2 .

It is a cyclic number.

It is not a de Polignac number, because 819895741081 - 2¹⁹ = 819895216793 is a prime.

It is a super-2 number, since 2×819895741081² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (819895741481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 409947870540 + 409947870541.

It is an arithmetic number, because the mean of its divisors is an integer number (409947870541).

Almost surely, 2^819895741081 is an apocalyptic number.

It is an amenable number.

819895741081 is a deficient number, since it is larger than the sum of its proper divisors (1).

819895741081 is an equidigital number, since it uses as much as digits as its factorization.

819895741081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5806080, while the sum is 61.

The spelling of 819895741081 in words is "eight hundred nineteen billion, eight hundred ninety-five million, seven hundred forty-one thousand, eighty-one".