4979991 has 4 divisors (see below), whose sum is σ = 6639992. Its totient is φ = 3319992.

The previous prime is 4979977. The next prime is 4979993. The reversal of 4979991 is 1999794.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 4979991 - 2⁹ = 4979479 is a prime.

It is a D-number.

It is a Duffinian number.

4979991 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 4979991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4979993) 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, 829996 + ... + 830001.

It is an arithmetic number, because the mean of its divisors is an integer number (1659998).

Almost surely, 2^4979991 is an apocalyptic number.

4979991 is a deficient number, since it is larger than the sum of its proper divisors (1660001).

4979991 is a wasteful number, since it uses less digits than its factorization.

4979991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1660000.

The product of its digits is 183708, while the sum is 48.

The square root of 4979991 is about 2231.5893439430. The cubic root of 4979991 is about 170.7691903286.

The spelling of 4979991 in words is "four million, nine hundred seventy-nine thousand, nine hundred ninety-one".