2805181 has 2 divisors, whose sum is σ = 2805182. Its totient is φ = 2805180.

The previous prime is 2805169. The next prime is 2805193. The reversal of 2805181 is 1815082.

It is a balanced prime because it is at equal distance from previous prime (2805169) and next prime (2805193).

It can be written as a sum of positive squares in only one way, i.e., 2752281 + 52900 = 1659^2 + 230^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2805181 is a prime.

It is a super-2 number, since 2×2805181² = 15738080885522, which contains 22 as substring.

2805181 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2805161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1402590 + 1402591.

It is an arithmetic number, because the mean of its divisors is an integer number (1402591).

2^2805181 is an apocalyptic number.

It is an amenable number.

2805181 is a deficient number, since it is larger than the sum of its proper divisors (1).

2805181 is an equidigital number, since it uses as much as digits as its factorization.

2805181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 640, while the sum is 25.

The square root of 2805181 is about 1674.8674574425. The cubic root of 2805181 is about 141.0328545407.

Subtracting from 2805181 its reverse (1815082), we obtain a palindrome (990099).

It can be divided in two parts, 2805 and 181, that multiplied together give a palindrome (507705).

The spelling of 2805181 in words is "two million, eight hundred five thousand, one hundred eighty-one".