4991813 has 16 divisors (see below), whose sum is σ = 5505600. Its totient is φ = 4510080.

The previous prime is 4991803. The next prime is 4991839. The reversal of 4991813 is 3181994.

It is a cyclic number.

It is not a de Polignac number, because 4991813 - 2²² = 797509 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4991803) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 68345 + ... + 68417.

It is an arithmetic number, because the mean of its divisors is an integer number (344100).

Almost surely, 2^4991813 is an apocalyptic number.

It is an amenable number.

4991813 is a deficient number, since it is larger than the sum of its proper divisors (513787).

4991813 is a wasteful number, since it uses less digits than its factorization.

4991813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 212.

The product of its digits is 7776, while the sum is 35.

The square root of 4991813 is about 2234.2365586482. The cubic root of 4991813 is about 170.9042131943.

The spelling of 4991813 in words is "four million, nine hundred ninety-one thousand, eight hundred thirteen".