201181 has 4 divisors (see below), whose sum is σ = 209952. Its totient is φ = 192412.

The previous prime is 201167. The next prime is 201193. The reversal of 201181 is 181102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-201181 is a prime.

It is a super-2 number, since 2×201181² = 80947589522, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4351 + ... + 4396.

It is an arithmetic number, because the mean of its divisors is an integer number (52488).

2²⁰¹¹⁸¹ is an apocalyptic number.

It is an amenable number.

201181 is a deficient number, since it is larger than the sum of its proper divisors (8771).

201181 is an equidigital number, since it uses as much as digits as its factorization.

201181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8770.

The product of its (nonzero) digits is 16, while the sum is 13.

The square root of 201181 is about 448.5320501369. The cubic root of 201181 is about 58.5952377637.

Adding to 201181 its reverse (181102), we get a palindrome (382283).

The spelling of 201181 in words is "two hundred one thousand, one hundred eighty-one".