201661181 has 8 divisors (see below), whose sum is σ = 205799328. Its totient is φ = 197550000.

The previous prime is 201661177. The next prime is 201661241. The reversal of 201661181 is 181166102.

201661181 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 201661181 - 2² = 201661177 is a prime.

It is a super-2 number, since 2×201661181² = 81334463844629522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 201661181.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201661151) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8726 + ... + 21896.

It is an arithmetic number, because the mean of its divisors is an integer number (25724916).

Almost surely, 2^201661181 is an apocalyptic number.

It is an amenable number.

201661181 is a deficient number, since it is larger than the sum of its proper divisors (4138147).

201661181 is a wasteful number, since it uses less digits than its factorization.

201661181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13483.

The product of its (nonzero) digits is 576, while the sum is 26.

The square root of 201661181 is about 14200.7457902745. The cubic root of 201661181 is about 586.4181930660.

The spelling of 201661181 in words is "two hundred one million, six hundred sixty-one thousand, one hundred eighty-one".