4991754221 has 2 divisors, whose sum is σ = 4991754222. Its totient is φ = 4991754220.

The previous prime is 4991754203. The next prime is 4991754247. The reversal of 4991754221 is 1224571994.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3518269225 + 1473484996 = 59315^2 + 38386^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4991754221 is a prime.

It is a super-2 number, since 2×4991754221² = 49835220405742633682, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4991654221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2495877110 + 2495877111.

It is an arithmetic number, because the mean of its divisors is an integer number (2495877111).

Almost surely, 2^4991754221 is an apocalyptic number.

It is an amenable number.

4991754221 is a deficient number, since it is larger than the sum of its proper divisors (1).

4991754221 is an equidigital number, since it uses as much as digits as its factorization.

4991754221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 181440, while the sum is 44.

The square root of 4991754221 is about 70652.3475972313. The cubic root of 4991754221 is about 1709.0354238807.

The spelling of 4991754221 in words is "four billion, nine hundred ninety-one million, seven hundred fifty-four thousand, two hundred twenty-one".