181898884901 has 2 divisors, whose sum is σ = 181898884902. Its totient is φ = 181898884900.

The previous prime is 181898884859. The next prime is 181898884907. The reversal of 181898884901 is 109488898181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 93865027876 + 88033857025 = 306374^2 + 296705^2 .

It is a cyclic number.

It is not a de Polignac number, because 181898884901 - 2¹⁰ = 181898883877 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (181898884907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90949442450 + 90949442451.

It is an arithmetic number, because the mean of its divisors is an integer number (90949442451).

Almost surely, 2^181898884901 is an apocalyptic number.

It is an amenable number.

181898884901 is a deficient number, since it is larger than the sum of its proper divisors (1).

181898884901 is an equidigital number, since it uses as much as digits as its factorization.

181898884901 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10616832, while the sum is 65.

The spelling of 181898884901 in words is "one hundred eighty-one billion, eight hundred ninety-eight million, eight hundred eighty-four thousand, nine hundred one".