7684375981 has 2 divisors, whose sum is σ = 7684375982. Its totient is φ = 7684375980.

The previous prime is 7684375913. The next prime is 7684375991. The reversal of 7684375981 is 1895734867.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7079707881 + 604668100 = 84141^2 + 24590^2 .

It is a cyclic number.

It is not a de Polignac number, because 7684375981 - 2⁹ = 7684375469 is a prime.

It is a super-2 number, since 2×7684375981² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7684375901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3842187990 + 3842187991.

It is an arithmetic number, because the mean of its divisors is an integer number (3842187991).

Almost surely, 2^7684375981 is an apocalyptic number.

It is an amenable number.

7684375981 is a deficient number, since it is larger than the sum of its proper divisors (1).

7684375981 is an equidigital number, since it uses as much as digits as its factorization.

7684375981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10160640, while the sum is 58.

The square root of 7684375981 is about 87660.5725568799. The cubic root of 7684375981 is about 1973.3443139119.

The spelling of 7684375981 in words is "seven billion, six hundred eighty-four million, three hundred seventy-five thousand, nine hundred eighty-one".