201661183 has 4 divisors (see below), whose sum is σ = 201738600. Its totient is φ = 201583768.

The previous prime is 201661177. The next prime is 201661241. The reversal of 201661183 is 381166102.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 201661183 - 2⁵ = 201661151 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201661153) 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, 34660 + ... + 40057.

It is an arithmetic number, because the mean of its divisors is an integer number (50434650).

Almost surely, 2^201661183 is an apocalyptic number.

201661183 is a deficient number, since it is larger than the sum of its proper divisors (77417).

201661183 is an equidigital number, since it uses as much as digits as its factorization.

201661183 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77416.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 201661183 is about 14200.7458606934. The cubic root of 201661183 is about 586.4181950046.

The spelling of 201661183 in words is "two hundred one million, six hundred sixty-one thousand, one hundred eighty-three".