201231030181 has 2 divisors, whose sum is σ = 201231030182. Its totient is φ = 201231030180.

The previous prime is 201231030151. The next prime is 201231030229. The reversal of 201231030181 is 181030132102.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 192045532900 + 9185497281 = 438230^2 + 95841^2 .

It is a cyclic number.

It is not a de Polignac number, because 201231030181 - 2⁵ = 201231030149 is a prime.

It is a super-2 number, since 2×201231030181² (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 (201231030151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100615515090 + 100615515091.

It is an arithmetic number, because the mean of its divisors is an integer number (100615515091).

Almost surely, 2^201231030181 is an apocalyptic number.

It is an amenable number.

201231030181 is a deficient number, since it is larger than the sum of its proper divisors (1).

201231030181 is an equidigital number, since it uses as much as digits as its factorization.

201231030181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 22.

Adding to 201231030181 its reverse (181030132102), we get a palindrome (382261162283).

The spelling of 201231030181 in words is "two hundred one billion, two hundred thirty-one million, thirty thousand, one hundred eighty-one".