2605181 has 4 divisors (see below), whose sum is σ = 2668764. Its totient is φ = 2541600.

The previous prime is 2605177. The next prime is 2605189. The reversal of 2605181 is 1815062.

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 1020100 + 1585081 = 1010^2 + 1259^2 .

It is a cyclic number.

It is not a de Polignac number, because 2605181 - 2² = 2605177 is a prime.

It is a super-2 number, since 2×2605181² = 13573936085522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2605189) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31730 + ... + 31811.

It is an arithmetic number, because the mean of its divisors is an integer number (667191).

2^2605181 is an apocalyptic number.

It is an amenable number.

2605181 is a deficient number, since it is larger than the sum of its proper divisors (63583).

2605181 is an equidigital number, since it uses as much as digits as its factorization.

2605181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63582.

The product of its (nonzero) digits is 480, while the sum is 23.

The square root of 2605181 is about 1614.0573100110. The cubic root of 2605181 is about 137.5981624112.

The spelling of 2605181 in words is "two million, six hundred five thousand, one hundred eighty-one".