7971871225 has 12 divisors (see below), whose sum is σ = 9886248316. Its totient is φ = 6376769280.

The previous prime is 7971871163. The next prime is 7971871261. The reversal of 7971871225 is 5221781797.

It can be written as a sum of positive squares in 6 ways, for example, as 799136361 + 7172734864 = 28269^2 + 84692^2 .

It is not a de Polignac number, because 7971871225 - 2¹³ = 7971863033 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 in 11 ways as a sum of consecutive naturals, for example, 356989 + ... + 378661.

Almost surely, 2^7971871225 is an apocalyptic number.

It is an amenable number.

7971871225 is a deficient number, since it is larger than the sum of its proper divisors (1914377091).

7971871225 is a wasteful number, since it uses less digits than its factorization.

7971871225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36396 (or 36391 counting only the distinct ones).

The product of its digits is 493920, while the sum is 49.

The square root of 7971871225 is about 89285.3360020558. The cubic root of 7971871225 is about 1997.6531827181.

The spelling of 7971871225 in words is "seven billion, nine hundred seventy-one million, eight hundred seventy-one thousand, two hundred twenty-five".