9981997325 has 12 divisors (see below), whose sum is σ = 12383279220. Its totient is φ = 7981983360.

The previous prime is 9981997279. The next prime is 9981997331. The reversal of 9981997325 is 5237991899.

It can be written as a sum of positive squares in 6 ways, for example, as 630913924 + 9351083401 = 25118^2 + 96701^2 .

It is not a de Polignac number, because 9981997325 - 2¹⁴ = 9981980941 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 33320 + ... + 145169.

It is an arithmetic number, because the mean of its divisors is an integer number (1031939935).

Almost surely, 2^9981997325 is an apocalyptic number.

It is an amenable number.

9981997325 is a deficient number, since it is larger than the sum of its proper divisors (2401281895).

9981997325 is a wasteful number, since it uses less digits than its factorization.

9981997325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180736 (or 180731 counting only the distinct ones).

The product of its digits is 11022480, while the sum is 62.

The square root of 9981997325 is about 99909.9460764543. The cubic root of 9981997325 is about 2153.1410605102.

The spelling of 9981997325 in words is "nine billion, nine hundred eighty-one million, nine hundred ninety-seven thousand, three hundred twenty-five".