20081161 has 2 divisors, whose sum is σ = 20081162. Its totient is φ = 20081160.

The previous prime is 20081153. The next prime is 20081197. The reversal of 20081161 is 16118002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18966025 + 1115136 = 4355^2 + 1056^2 .

It is a cyclic number.

It is not a de Polignac number, because 20081161 - 2³ = 20081153 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20081561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10040580 + 10040581.

It is an arithmetic number, because the mean of its divisors is an integer number (10040581).

Almost surely, 2^20081161 is an apocalyptic number.

It is an amenable number.

20081161 is a deficient number, since it is larger than the sum of its proper divisors (1).

20081161 is an equidigital number, since it uses as much as digits as its factorization.

20081161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 19.

The square root of 20081161 is about 4481.2008435240. The cubic root of 20081161 is about 271.8084408520.

Adding to 20081161 its reverse (16118002), we get a palindrome (36199163).

The spelling of 20081161 in words is "twenty million, eighty-one thousand, one hundred sixty-one".