2665181 has 2 divisors, whose sum is σ = 2665182. Its totient is φ = 2665180.

The previous prime is 2665177. The next prime is 2665189. The reversal of 2665181 is 1815662.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2656900 + 8281 = 1630^2 + 91^2 .

It is a cyclic number.

It is not a de Polignac number, because 2665181 - 2² = 2665177 is a prime.

It is a super-2 number, since 2×2665181² = 14206379525522, which contains 22 as substring.

It is a Chen prime.

It is a plaindrome in base 16.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2665189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1332590 + 1332591.

It is an arithmetic number, because the mean of its divisors is an integer number (1332591).

2^2665181 is an apocalyptic number.

It is an amenable number.

2665181 is a deficient number, since it is larger than the sum of its proper divisors (1).

2665181 is an equidigital number, since it uses as much as digits as its factorization.

2665181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2880, while the sum is 29.

The square root of 2665181 is about 1632.5382078224. The cubic root of 2665181 is about 138.6464974928.

The spelling of 2665181 in words is "two million, six hundred sixty-five thousand, one hundred eighty-one".