201001181 has 2 divisors, whose sum is σ = 201001182. Its totient is φ = 201001180.

The previous prime is 201001159. The next prime is 201001219. The reversal of 201001181 is 181100102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 193488100 + 7513081 = 13910^2 + 2741^2 .

It is a cyclic number.

It is not a de Polignac number, because 201001181 - 2²² = 196806877 is a prime.

It is a super-2 number, since 2×201001181² = 80802949526789522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201007181) 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, 100500590 + 100500591.

It is an arithmetic number, because the mean of its divisors is an integer number (100500591).

Almost surely, 2^201001181 is an apocalyptic number.

It is an amenable number.

201001181 is a deficient number, since it is larger than the sum of its proper divisors (1).

201001181 is an equidigital number, since it uses as much as digits as its factorization.

201001181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16, while the sum is 14.

The square root of 201001181 is about 14177.4885293553. The cubic root of 201001181 is about 585.7777475301. Note that the first 4 decimals are identical.

Adding to 201001181 its reverse (181100102), we get a palindrome (382101283).

The spelling of 201001181 in words is "two hundred one million, one thousand, one hundred eighty-one".