7921841761 has 2 divisors, whose sum is σ = 7921841762. Its totient is φ = 7921841760.

The previous prime is 7921841743. The next prime is 7921841783. The reversal of 7921841761 is 1671481297.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7822341136 + 99500625 = 88444^2 + 9975^2 .

It is a cyclic number.

It is not a de Polignac number, because 7921841761 - 2²³ = 7913453153 is a prime.

It is a super-2 number, since 2×7921841761² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (7921841731) 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 as a sum of consecutive naturals, namely, 3960920880 + 3960920881.

It is an arithmetic number, because the mean of its divisors is an integer number (3960920881).

Almost surely, 2^7921841761 is an apocalyptic number.

It is an amenable number.

7921841761 is a deficient number, since it is larger than the sum of its proper divisors (1).

7921841761 is an equidigital number, since it uses as much as digits as its factorization.

7921841761 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 169344, while the sum is 46.

The square root of 7921841761 is about 89004.7288687517. The cubic root of 7921841761 is about 1993.4654867368.

The spelling of 7921841761 in words is "seven billion, nine hundred twenty-one million, eight hundred forty-one thousand, seven hundred sixty-one".