2279681 has 4 divisors (see below), whose sum is σ = 2341332. Its totient is φ = 2218032.

The previous prime is 2279663. The next prime is 2279687. The reversal of 2279681 is 1869722.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1869722 = 2 ⋅934861.

It can be written as a sum of positive squares in 2 ways, for example, as 801025 + 1478656 = 895^2 + 1216^2 .

It is a cyclic number.

It is not a de Polignac number, because 2279681 - 2⁶ = 2279617 is a prime.

It is a super-2 number, since 2×2279681² = 10393890923522, which contains 22 as substring.

It is a d-powerful number, because it can be written as 2¹⁴ + 2¹⁸ + 7³ + 9⁵ + 6⁸ + 8⁶ + 1 .

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2279687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30770 + ... + 30843.

It is an arithmetic number, because the mean of its divisors is an integer number (585333).

2^2279681 is an apocalyptic number.

It is an amenable number.

2279681 is a deficient number, since it is larger than the sum of its proper divisors (61651).

2279681 is an equidigital number, since it uses as much as digits as its factorization.

2279681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61650.

The product of its digits is 12096, while the sum is 35.

The square root of 2279681 is about 1509.8612519036. The cubic root of 2279681 is about 131.6107487456.

The spelling of 2279681 in words is "two million, two hundred seventy-nine thousand, six hundred eighty-one".