4991564 has 12 divisors (see below), whose sum is σ = 8769600. Its totient is φ = 2485968.

The previous prime is 4991563. The next prime is 4991573. The reversal of 4991564 is 4651994.

It is a super-2 number, since 2×4991564² = 49831422332192, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (4991561) 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, 1244 + ... + 3395.

It is an arithmetic number, because the mean of its divisors is an integer number (730800).

Almost surely, 2^4991564 is an apocalyptic number.

It is an amenable number.

4991564 is a deficient number, since it is larger than the sum of its proper divisors (3778036).

4991564 is a wasteful number, since it uses less digits than its factorization.

4991564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4912 (or 4910 counting only the distinct ones).

The product of its digits is 38880, while the sum is 38.

The square root of 4991564 is about 2234.1808342209. The cubic root of 4991564 is about 170.9013714842.

It can be divided in two parts, 4991 and 564, that added together give a palindrome (5555).

The spelling of 4991564 in words is "four million, nine hundred ninety-one thousand, five hundred sixty-four".