7791818213 has 2 divisors, whose sum is σ = 7791818214. Its totient is φ = 7791818212.

The previous prime is 7791818201. The next prime is 7791818219. The reversal of 7791818213 is 3128181977.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7718852449 + 72965764 = 87857^2 + 8542^2 .

It is a cyclic number.

It is not a de Polignac number, because 7791818213 - 2¹⁶ = 7791752677 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7791818219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3895909106 + 3895909107.

It is an arithmetic number, because the mean of its divisors is an integer number (3895909107).

Almost surely, 2^7791818213 is an apocalyptic number.

It is an amenable number.

7791818213 is a deficient number, since it is larger than the sum of its proper divisors (1).

7791818213 is an equidigital number, since it uses as much as digits as its factorization.

7791818213 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 169344, while the sum is 47.

The square root of 7791818213 is about 88271.2762624400. The cubic root of 7791818213 is about 1982.4988187830.

The spelling of 7791818213 in words is "seven billion, seven hundred ninety-one million, eight hundred eighteen thousand, two hundred thirteen".