2265681 has 16 divisors (see below), whose sum is σ = 3345408. Its totient is φ = 1352400.

The previous prime is 2265677. The next prime is 2265721. The reversal of 2265681 is 1865622.

2265681 is nontrivially palindromic in base 2.

It is not a de Polignac number, because 2265681 - 2² = 2265677 is a prime.

It is a super-2 number, since 2×2265681² = 10266620787522, which contains 22 as substring.

2265681 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2265611) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1860 + ... + 2826.

It is an arithmetic number, because the mean of its divisors is an integer number (209088).

2^2265681 is an apocalyptic number.

It is an amenable number.

2265681 is a deficient number, since it is larger than the sum of its proper divisors (1079727).

2265681 is a wasteful number, since it uses less digits than its factorization.

2265681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1052.

The product of its digits is 5760, while the sum is 30.

The square root of 2265681 is about 1505.2179244216. The cubic root of 2265681 is about 131.3407789217.

It can be divided in two parts, 22 and 65681, that added together give a triangular number (65703 = T₃₆₂).

The spelling of 2265681 in words is "two million, two hundred sixty-five thousand, six hundred eighty-one".