2781181 has 8 divisors (see below), whose sum is σ = 3008600. Its totient is φ = 2555712.

The previous prime is 2781169. The next prime is 2781193. The reversal of 2781181 is 1811872.

It is an interprime number because it is at equal distance from previous prime (2781169) and next prime (2781193).

It can be written as a sum of positive squares in 4 ways, for example, as 5625 + 2775556 = 75^2 + 1666^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2781181 - 2¹⁵ = 2748413 is a prime.

It is a super-2 number, since 2×2781181² = 15469935509522, 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 (2784181) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4231 + ... + 4843.

It is an arithmetic number, because the mean of its divisors is an integer number (376075).

2^2781181 is an apocalyptic number.

It is an amenable number.

2781181 is a deficient number, since it is larger than the sum of its proper divisors (227419).

2781181 is a wasteful number, since it uses less digits than its factorization.

2781181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 975.

The product of its digits is 896, while the sum is 28.

The square root of 2781181 is about 1667.6873208129. The cubic root of 2781181 is about 140.6294952308.

The spelling of 2781181 in words is "two million, seven hundred eighty-one thousand, one hundred eighty-one".