2551181 has 4 divisors (see below), whose sum is σ = 2554812. Its totient is φ = 2547552.

The previous prime is 2551177. The next prime is 2551223. The reversal of 2551181 is 1811552.

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 422500 + 2128681 = 650^2 + 1459^2 .

It is a cyclic number.

It is not a de Polignac number, because 2551181 - 2² = 2551177 is a prime.

It is a super-2 number, since 2×2551181² = 13017048989522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2551481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 386 + ... + 2291.

It is an arithmetic number, because the mean of its divisors is an integer number (638703).

2^2551181 is an apocalyptic number.

It is an amenable number.

2551181 is a deficient number, since it is larger than the sum of its proper divisors (3631).

2551181 is an equidigital number, since it uses as much as digits as its factorization.

2551181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3630.

The product of its digits is 400, while the sum is 23.

The square root of 2551181 is about 1597.2416849056. The cubic root of 2551181 is about 136.6408087770.

The spelling of 2551181 in words is "two million, five hundred fifty-one thousand, one hundred eighty-one".