4991748217 has 2 divisors, whose sum is σ = 4991748218. Its totient is φ = 4991748216.

The previous prime is 4991748197. The next prime is 4991748269. The reversal of 4991748217 is 7128471994.

It is a happy number.

It is an a-pointer prime, because the next prime (4991748269) can be obtained adding 4991748217 to its sum of digits (52).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3960310761 + 1031437456 = 62931^2 + 32116^2 .

It is a cyclic number.

It is not a de Polignac number, because 4991748217 - 2³¹ = 2844264569 is a prime.

It is a weakly prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2495874108 + 2495874109.

It is an arithmetic number, because the mean of its divisors is an integer number (2495874109).

Almost surely, 2^4991748217 is an apocalyptic number.

It is an amenable number.

4991748217 is a deficient number, since it is larger than the sum of its proper divisors (1).

4991748217 is an equidigital number, since it uses as much as digits as its factorization.

4991748217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1016064, while the sum is 52.

The square root of 4991748217 is about 70652.3051074769. The cubic root of 4991748217 is about 1709.0347386806.

The spelling of 4991748217 in words is "four billion, nine hundred ninety-one million, seven hundred forty-eight thousand, two hundred seventeen".