4777991 has 4 divisors (see below), whose sum is σ = 4782984. Its totient is φ = 4773000.

The previous prime is 4777967. The next prime is 4778009. The reversal of 4777991 is 1997774.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4777991 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 (4777961) 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, 560 + ... + 3141.

It is an arithmetic number, because the mean of its divisors is an integer number (1195746).

Almost surely, 2^4777991 is an apocalyptic number.

4777991 is a deficient number, since it is larger than the sum of its proper divisors (4993).

4777991 is a wasteful number, since it uses less digits than its factorization.

4777991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4992.

The product of its digits is 111132, while the sum is 44.

The square root of 4777991 is about 2185.8616150159. The cubic root of 4777991 is about 168.4283170335.

The spelling of 4777991 in words is "four million, seven hundred seventy-seven thousand, nine hundred ninety-one".