4991197 has 4 divisors (see below), whose sum is σ = 5010876. Its totient is φ = 4971520.

The previous prime is 4991171. The next prime is 4991201. The reversal of 4991197 is 7911994.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 4901796 + 89401 = 2214^2 + 299^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4991197 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 (4991137) 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, 9454 + ... + 9967.

It is an arithmetic number, because the mean of its divisors is an integer number (1252719).

Almost surely, 2^4991197 is an apocalyptic number.

It is an amenable number.

4991197 is a deficient number, since it is larger than the sum of its proper divisors (19679).

4991197 is a wasteful number, since it uses less digits than its factorization.

4991197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19678.

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

The square root of 4991197 is about 2234.0986996997. The cubic root of 4991197 is about 170.8971829279.

The spelling of 4991197 in words is "four million, nine hundred ninety-one thousand, one hundred ninety-seven".