2261881 has 4 divisors (see below), whose sum is σ = 2304612. Its totient is φ = 2219152.

The previous prime is 2261863. The next prime is 2261887. The reversal of 2261881 is 1881622.

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 1478656 + 783225 = 1216^2 + 885^2 .

It is a cyclic number.

It is not a de Polignac number, because 2261881 - 2¹¹ = 2259833 is a prime.

It is a super-2 number, since 2×2261881² = 10232211316322, which contains 22 as substring.

It is a Duffinian number.

2261881 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2261887) 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, 21286 + ... + 21391.

It is an arithmetic number, because the mean of its divisors is an integer number (576153).

2^2261881 is an apocalyptic number.

It is an amenable number.

2261881 is a deficient number, since it is larger than the sum of its proper divisors (42731).

2261881 is an equidigital number, since it uses as much as digits as its factorization.

2261881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42730.

The product of its digits is 1536, while the sum is 28.

The square root of 2261881 is about 1503.9551190112. The cubic root of 2261881 is about 131.2673095840.

The spelling of 2261881 in words is "two million, two hundred sixty-one thousand, eight hundred eighty-one".