7917794789 has 2 divisors, whose sum is σ = 7917794790. Its totient is φ = 7917794788.

The previous prime is 7917794783. The next prime is 7917794813. The reversal of 7917794789 is 9874977197.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7260744100 + 657050689 = 85210^2 + 25633^2 .

It is an emirp because it is prime and its reverse (9874977197) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7917794789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7917794783) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3958897394 + 3958897395.

It is an arithmetic number, because the mean of its divisors is an integer number (3958897395).

Almost surely, 2^7917794789 is an apocalyptic number.

It is an amenable number.

7917794789 is a deficient number, since it is larger than the sum of its proper divisors (1).

7917794789 is an equidigital number, since it uses as much as digits as its factorization.

7917794789 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 56010528, while the sum is 68.

The square root of 7917794789 is about 88981.9913746596. The cubic root of 7917794789 is about 1993.1259666506.

The spelling of 7917794789 in words is "seven billion, nine hundred seventeen million, seven hundred ninety-four thousand, seven hundred eighty-nine".