7971725281 has 24 divisors (see below), whose sum is σ = 8778981120. Its totient is φ = 7195677120.

The previous prime is 7971725257. The next prime is 7971725287. The reversal of 7971725281 is 1825271797.

It is not a de Polignac number, because 7971725281 - 2²¹ = 7969628129 is a prime.

It is a super-2 number, since 2×7971725281² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (7971725287) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10786810 + ... + 10787548.

It is an arithmetic number, because the mean of its divisors is an integer number (365790880).

Almost surely, 2^7971725281 is an apocalyptic number.

It is an amenable number.

7971725281 is a deficient number, since it is larger than the sum of its proper divisors (807255839).

7971725281 is a wasteful number, since it uses less digits than its factorization.

7971725281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1097 (or 1036 counting only the distinct ones).

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

The square root of 7971725281 is about 89284.5187084525. The cubic root of 7971725281 is about 1997.6409920514.

The spelling of 7971725281 in words is "seven billion, nine hundred seventy-one million, seven hundred twenty-five thousand, two hundred eighty-one".