9981225 has 72 divisors (see below), whose sum is σ = 19498752. Its totient is φ = 5054400.

The previous prime is 9981221. The next prime is 9981229. The reversal of 9981225 is 5221899.

It is an interprime number because it is at equal distance from previous prime (9981221) and next prime (9981229).

It is not a de Polignac number, because 9981225 - 2² = 9981221 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 9981225.

It is not an unprimeable number, because it can be changed into a prime (9981221) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 188299 + ... + 188351.

It is an arithmetic number, because the mean of its divisors is an integer number (270816).

Almost surely, 2^9981225 is an apocalyptic number.

It is an amenable number.

9981225 is a deficient number, since it is larger than the sum of its proper divisors (9517527).

9981225 is a wasteful number, since it uses less digits than its factorization.

9981225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109 (or 92 counting only the distinct ones).

The product of its digits is 12960, while the sum is 36.

The square root of 9981225 is about 3159.3076773243. The cubic root of 9981225 is about 215.3085528285.

The spelling of 9981225 in words is "nine million, nine hundred eighty-one thousand, two hundred twenty-five".