7974518813 has 2 divisors, whose sum is σ = 7974518814. Its totient is φ = 7974518812.

The previous prime is 7974518749. The next prime is 7974518863. The reversal of 7974518813 is 3188154797.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5282673124 + 2691845689 = 72682^2 + 51883^2 .

It is an emirp because it is prime and its reverse (3188154797) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7974518813 - 2⁶ = 7974518749 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7974518863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3987259406 + 3987259407.

It is an arithmetic number, because the mean of its divisors is an integer number (3987259407).

Almost surely, 2^7974518813 is an apocalyptic number.

It is an amenable number.

7974518813 is a deficient number, since it is larger than the sum of its proper divisors (1).

7974518813 is an equidigital number, since it uses as much as digits as its factorization.

7974518813 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1693440, while the sum is 53.

The square root of 7974518813 is about 89300.1613268420. The cubic root of 7974518813 is about 1997.8743092699.

The spelling of 7974518813 in words is "seven billion, nine hundred seventy-four million, five hundred eighteen thousand, eight hundred thirteen".