202201981181 has 2 divisors, whose sum is σ = 202201981182. Its totient is φ = 202201981180.

The previous prime is 202201981141. The next prime is 202201981183. The reversal of 202201981181 is 181189102202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 185390524900 + 16811456281 = 430570^2 + 129659^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-202201981181 is a prime.

It is a super-2 number, since 2×202201981181² (a number of 23 digits) contains 22 as substring.

It is a Sophie Germain prime.

Together with 202201981183, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (202201981183) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101100990590 + 101100990591.

It is an arithmetic number, because the mean of its divisors is an integer number (101100990591).

Almost surely, 2^202201981181 is an apocalyptic number.

It is an amenable number.

202201981181 is a deficient number, since it is larger than the sum of its proper divisors (1).

202201981181 is an equidigital number, since it uses as much as digits as its factorization.

202201981181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4608, while the sum is 35.

The spelling of 202201981181 in words is "two hundred two billion, two hundred one million, nine hundred eighty-one thousand, one hundred eighty-one".