2290181 has 2 divisors, whose sum is σ = 2290182. Its totient is φ = 2290180.

The previous prime is 2290177. The next prime is 2290207. The reversal of 2290181 is 1810922.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1221025 + 1069156 = 1105^2 + 1034^2 .

It is a cyclic number.

It is not a de Polignac number, because 2290181 - 2² = 2290177 is a prime.

It is a super-2 number, since 2×2290181² = 10489858025522, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2290151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1145090 + 1145091.

It is an arithmetic number, because the mean of its divisors is an integer number (1145091).

2^2290181 is an apocalyptic number.

It is an amenable number.

2290181 is a deficient number, since it is larger than the sum of its proper divisors (1).

2290181 is an equidigital number, since it uses as much as digits as its factorization.

2290181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 23.

The square root of 2290181 is about 1513.3343979438. The cubic root of 2290181 is about 131.8125016253.

The spelling of 2290181 in words is "two million, two hundred ninety thousand, one hundred eighty-one".