201912322181 has 2 divisors, whose sum is σ = 201912322182. Its totient is φ = 201912322180.

The previous prime is 201912322159. The next prime is 201912322187. The reversal of 201912322181 is 181223219102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 176791657156 + 25120665025 = 420466^2 + 158495^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-201912322181 is a prime.

It is a super-2 number, since 2×201912322181² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201912322187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100956161090 + 100956161091.

It is an arithmetic number, because the mean of its divisors is an integer number (100956161091).

Almost surely, 2^201912322181 is an apocalyptic number.

It is an amenable number.

201912322181 is a deficient number, since it is larger than the sum of its proper divisors (1).

201912322181 is an equidigital number, since it uses as much as digits as its factorization.

201912322181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 32.

The spelling of 201912322181 in words is "two hundred one billion, nine hundred twelve million, three hundred twenty-two thousand, one hundred eighty-one".