7807853981 has 2 divisors, whose sum is σ = 7807853982. Its totient is φ = 7807853980.

The previous prime is 7807853971. The next prime is 7807854011. The reversal of 7807853981 is 1893587087.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7175784100 + 632069881 = 84710^2 + 25141^2 .

It is a cyclic number.

It is not a de Polignac number, because 7807853981 - 2¹⁸ = 7807591837 is a prime.

It is a super-2 number, since 2×7807853981² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7807853941) 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, 3903926990 + 3903926991.

It is an arithmetic number, because the mean of its divisors is an integer number (3903926991).

Almost surely, 2^7807853981 is an apocalyptic number.

It is an amenable number.

7807853981 is a deficient number, since it is larger than the sum of its proper divisors (1).

7807853981 is an equidigital number, since it uses as much as digits as its factorization.

7807853981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3386880, while the sum is 56.

The square root of 7807853981 is about 88362.0618874413. The cubic root of 7807853981 is about 1983.8578985390.

The spelling of 7807853981 in words is "seven billion, eight hundred seven million, eight hundred fifty-three thousand, nine hundred eighty-one".