2891563 has 4 divisors (see below), whose sum is σ = 2913768. Its totient is φ = 2869360.

The previous prime is 2891543. The next prime is 2891569. The reversal of 2891563 is 3651982.

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 2891563 - 2⁹ = 2891051 is a prime.

It is a super-2 number, since 2×2891563² = 16722273165938, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2891569) 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, 10906 + ... + 11167.

It is an arithmetic number, because the mean of its divisors is an integer number (728442).

2^2891563 is an apocalyptic number.

2891563 is a deficient number, since it is larger than the sum of its proper divisors (22205).

2891563 is a wasteful number, since it uses less digits than its factorization.

2891563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22204.

The product of its digits is 12960, while the sum is 34.

The square root of 2891563 is about 1700.4596437434. The cubic root of 2891563 is about 142.4658869816.

The spelling of 2891563 in words is "two million, eight hundred ninety-one thousand, five hundred sixty-three".