201161161 has 4 divisors (see below), whose sum is σ = 201265092. Its totient is φ = 201057232.

The previous prime is 201161137. The next prime is 201161167. The reversal of 201161161 is 161161102.

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

It can be written as a sum of positive squares in 2 ways, for example, as 139240000 + 61921161 = 11800^2 + 7869^2 .

It is a cyclic number.

It is not a de Polignac number, because 201161161 - 2¹³ = 201152969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (201161167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49006 + ... + 52951.

It is an arithmetic number, because the mean of its divisors is an integer number (50316273).

Almost surely, 2^201161161 is an apocalyptic number.

It is an amenable number.

201161161 is a deficient number, since it is larger than the sum of its proper divisors (103931).

201161161 is a wasteful number, since it uses less digits than its factorization.

201161161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103930.

The product of its (nonzero) digits is 72, while the sum is 19.

The square root of 201161161 is about 14183.1294501601. The cubic root of 201161161 is about 585.9331162234.

The spelling of 201161161 in words is "two hundred one million, one hundred sixty-one thousand, one hundred sixty-one".