4247991817 has 8 divisors (see below), whose sum is σ = 4370169024. Its totient is φ = 4127371248.

The previous prime is 4247991791. The next prime is 4247991827. The reversal of 4247991817 is 7181997424.

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 not a de Polignac number, because 4247991817 - 2⁷ = 4247991689 is a prime.

It is a super-2 number, since 2×4247991817² = 36090868954597922978, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4247991827) 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 in 7 ways as a sum of consecutive naturals, for example, 383623 + ... + 394540.

It is an arithmetic number, because the mean of its divisors is an integer number (546271128).

Almost surely, 2^4247991817 is an apocalyptic number.

It is an amenable number.

4247991817 is a deficient number, since it is larger than the sum of its proper divisors (122177207).

4247991817 is a wasteful number, since it uses less digits than its factorization.

4247991817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 778319.

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

The square root of 4247991817 is about 65176.6201716536. The cubic root of 4247991817 is about 1619.5507336467.

The spelling of 4247991817 in words is "four billion, two hundred forty-seven million, nine hundred ninety-one thousand, eight hundred seventeen".