801889195181 has 2 divisors, whose sum is σ = 801889195182. Its totient is φ = 801889195180.

The previous prime is 801889195157. The next prime is 801889195189. The reversal of 801889195181 is 181591988108.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 468855172900 + 333034022281 = 684730^2 + 577091^2 .

It is a cyclic number.

It is not a de Polignac number, because 801889195181 - 2⁶ = 801889195117 is a prime.

It is a super-2 number, since 2×801889195181² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 801889195181.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (801889195189) 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, 400944597590 + 400944597591.

It is an arithmetic number, because the mean of its divisors is an integer number (400944597591).

Almost surely, 2^801889195181 is an apocalyptic number.

It is an amenable number.

801889195181 is a deficient number, since it is larger than the sum of its proper divisors (1).

801889195181 is an equidigital number, since it uses as much as digits as its factorization.

801889195181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1658880, while the sum is 59.

The spelling of 801889195181 in words is "eight hundred one billion, eight hundred eighty-nine million, one hundred ninety-five thousand, one hundred eighty-one".