4991563 has 2 divisors, whose sum is σ = 4991564. Its totient is φ = 4991562.

The previous prime is 4991561. The next prime is 4991573. The reversal of 4991563 is 3651994.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 4991563 - 2¹ = 4991561 is a prime.

Together with 4991561, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (4991561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2495781 + 2495782.

It is an arithmetic number, because the mean of its divisors is an integer number (2495782).

Almost surely, 2^4991563 is an apocalyptic number.

4991563 is a deficient number, since it is larger than the sum of its proper divisors (1).

4991563 is an equidigital number, since it uses as much as digits as its factorization.

4991563 is an evil number, because the sum of its binary digits is even.

The product of its digits is 29160, while the sum is 37.

The square root of 4991563 is about 2234.1806104252. The cubic root of 4991563 is about 170.9013600715.

The spelling of 4991563 in words is "four million, nine hundred ninety-one thousand, five hundred sixty-three".