2663281 has 4 divisors (see below), whose sum is σ = 2700864. Its totient is φ = 2625700.

The previous prime is 2663279. The next prime is 2663293. The reversal of 2663281 is 1823662.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1823662 = 2 ⋅911831.

It is a cyclic number.

It is not a de Polignac number, because 2663281 - 2¹ = 2663279 is a prime.

It is a super-2 number, since 2×2663281² = 14186131369922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2663231) 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, 18685 + ... + 18826.

It is an arithmetic number, because the mean of its divisors is an integer number (675216).

2^2663281 is an apocalyptic number.

It is an amenable number.

2663281 is a deficient number, since it is larger than the sum of its proper divisors (37583).

2663281 is an equidigital number, since it uses as much as digits as its factorization.

2663281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37582.

The product of its digits is 3456, while the sum is 28.

The square root of 2663281 is about 1631.9561881374. The cubic root of 2663281 is about 138.6135427618.

The spelling of 2663281 in words is "two million, six hundred sixty-three thousand, two hundred eighty-one".