4991855 has 24 divisors (see below), whose sum is σ = 6792576. Its totient is φ = 3516480.

The previous prime is 4991849. The next prime is 4991867. The reversal of 4991855 is 5581994.

It is a happy number.

It is not a de Polignac number, because 4991855 - 2⁴ = 4991839 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 22274 + ... + 22496.

It is an arithmetic number, because the mean of its divisors is an integer number (283024).

Almost surely, 2^4991855 is an apocalyptic number.

4991855 is a deficient number, since it is larger than the sum of its proper divisors (1800721).

4991855 is a wasteful number, since it uses less digits than its factorization.

4991855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 287 (or 276 counting only the distinct ones).

The product of its digits is 64800, while the sum is 41.

The square root of 4991855 is about 2234.2459578122. The cubic root of 4991855 is about 170.9046925096.

The spelling of 4991855 in words is "four million, nine hundred ninety-one thousand, eight hundred fifty-five".