2545181 has 4 divisors (see below), whose sum is σ = 2551164. Its totient is φ = 2539200.

The previous prime is 2545177. The next prime is 2545187. The reversal of 2545181 is 1815452.

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 765625 + 1779556 = 875^2 + 1334^2 .

It is a cyclic number.

It is not a de Polignac number, because 2545181 - 2² = 2545177 is a prime.

It is a super-2 number, since 2×2545181² = 12955892645522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2545181.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2545187) 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, 2300 + ... + 3221.

It is an arithmetic number, because the mean of its divisors is an integer number (637791).

2^2545181 is an apocalyptic number.

It is an amenable number.

2545181 is a deficient number, since it is larger than the sum of its proper divisors (5983).

2545181 is an equidigital number, since it uses as much as digits as its factorization.

2545181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5982.

The product of its digits is 1600, while the sum is 26.

The square root of 2545181 is about 1595.3623412880. The cubic root of 2545181 is about 136.5336050399.

The spelling of 2545181 in words is "two million, five hundred forty-five thousand, one hundred eighty-one".