4991917 has 8 divisors (see below), whose sum is σ = 5826816. Its totient is φ = 4187472.

The previous prime is 4991893. The next prime is 4991923. The reversal of 4991917 is 7191994.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4991917 is a prime.

It is a Duffinian number.

4991917 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 4991917.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4991977) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7258 + ... + 7915.

It is an arithmetic number, because the mean of its divisors is an integer number (728352).

Almost surely, 2^4991917 is an apocalyptic number.

4991917 is a gapful number since it is divisible by the number (47) formed by its first and last digit.

It is an amenable number.

4991917 is a deficient number, since it is larger than the sum of its proper divisors (834899).

4991917 is a wasteful number, since it uses less digits than its factorization.

4991917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15227.

The product of its digits is 20412, while the sum is 40.

The square root of 4991917 is about 2234.2598326963. The cubic root of 4991917 is about 170.9054000654.

The spelling of 4991917 in words is "four million, nine hundred ninety-one thousand, nine hundred seventeen".