2801663 has 4 divisors (see below), whose sum is σ = 2810928. Its totient is φ = 2792400.

The previous prime is 2801641. The next prime is 2801681. The reversal of 2801663 is 3661082.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2801663 - 2⁶ = 2801599 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a plaindrome in base 4 and base 16.

It is a zygodrome in base 4.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2801693) 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, 4163 + ... + 4788.

It is an arithmetic number, because the mean of its divisors is an integer number (702732).

2^2801663 is an apocalyptic number.

2801663 is a deficient number, since it is larger than the sum of its proper divisors (9265).

2801663 is an equidigital number, since it uses as much as digits as its factorization.

2801663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9264.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 2801663 is about 1673.8168956012. The cubic root of 2801663 is about 140.9738730659.

The spelling of 2801663 in words is "two million, eight hundred one thousand, six hundred sixty-three".