4999991 has 4 divisors (see below), whose sum is σ = 5121984. Its totient is φ = 4878000.

The previous prime is 4999963. The next prime is 4999999. The reversal of 4999991 is 1999994.

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 4999991 - 2¹⁸ = 4737847 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 (4999999) 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, 60935 + ... + 61016.

It is an arithmetic number, because the mean of its divisors is an integer number (1280496).

Almost surely, 2^4999991 is an apocalyptic number.

4999991 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

4999991 is a deficient number, since it is larger than the sum of its proper divisors (121993).

4999991 is a wasteful number, since it uses less digits than its factorization.

4999991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121992.

The product of its digits is 236196, while the sum is 50.

The square root of 4999991 is about 2236.0659650377. The cubic root of 4999991 is about 170.9974920691.

The spelling of 4999991 in words is "four million, nine hundred ninety-nine thousand, nine hundred ninety-one".