4899991 has 4 divisors (see below), whose sum is σ = 4914000. Its totient is φ = 4885984.

The previous prime is 4899971. The next prime is 4899997. The reversal of 4899991 is 1999984.

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 4899991 - 2⁷ = 4899863 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 (4899997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6466 + ... + 7183.

It is an arithmetic number, because the mean of its divisors is an integer number (1228500).

Almost surely, 2^4899991 is an apocalyptic number.

4899991 is a deficient number, since it is larger than the sum of its proper divisors (14009).

4899991 is a wasteful number, since it uses less digits than its factorization.

4899991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14008.

The product of its digits is 209952, while the sum is 49.

The square root of 4899991 is about 2213.5923292242. The cubic root of 4899991 is about 169.8498212344.

It can be divided in two parts, 489999 and 1, that added together give a square (490000 = 700²).

The spelling of 4899991 in words is "four million, eight hundred ninety-nine thousand, nine hundred ninety-one".