7985391361 has 2 divisors, whose sum is σ = 7985391362. Its totient is φ = 7985391360.

The previous prime is 7985391329. The next prime is 7985391391. The reversal of 7985391361 is 1631935897.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7977883761 + 7507600 = 89319^2 + 2740^2 .

It is a cyclic number.

It is not a de Polignac number, because 7985391361 - 2⁵ = 7985391329 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 7985391299 and 7985391308.

It is not a weakly prime, because it can be changed into another prime (7985391391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3992695680 + 3992695681.

It is an arithmetic number, because the mean of its divisors is an integer number (3992695681).

Almost surely, 2^7985391361 is an apocalyptic number.

It is an amenable number.

7985391361 is a deficient number, since it is larger than the sum of its proper divisors (1).

7985391361 is an equidigital number, since it uses as much as digits as its factorization.

7985391361 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1224720, while the sum is 52.

The square root of 7985391361 is about 89361.0170096558. The cubic root of 7985391361 is about 1998.7818716490.

The spelling of 7985391361 in words is "seven billion, nine hundred eighty-five million, three hundred ninety-one thousand, three hundred sixty-one".