2251663 has 4 divisors (see below), whose sum is σ = 2261248. Its totient is φ = 2242080.

The previous prime is 2251649. The next prime is 2251673. The reversal of 2251663 is 3661522.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2251663 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2251603) 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, 4431 + ... + 4912.

It is an arithmetic number, because the mean of its divisors is an integer number (565312).

2^2251663 is an apocalyptic number.

2251663 is a deficient number, since it is larger than the sum of its proper divisors (9585).

2251663 is an equidigital number, since it uses as much as digits as its factorization.

2251663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9584.

The product of its digits is 2160, while the sum is 25.

The square root of 2251663 is about 1500.5542309427. The cubic root of 2251663 is about 131.0693454114.

The spelling of 2251663 in words is "two million, two hundred fifty-one thousand, six hundred sixty-three".