9981715 has 4 divisors (see below), whose sum is σ = 11978064. Its totient is φ = 7985368.

The previous prime is 9981691. The next prime is 9981731. The reversal of 9981715 is 5171899.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5171899 = 53 ⋅97583.

It is a cyclic number.

It is not a de Polignac number, because 9981715 - 2¹⁵ = 9948947 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 998167 + ... + 998176.

It is an arithmetic number, because the mean of its divisors is an integer number (2994516).

Almost surely, 2^9981715 is an apocalyptic number.

9981715 is a deficient number, since it is larger than the sum of its proper divisors (1996349).

9981715 is a wasteful number, since it uses less digits than its factorization.

9981715 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1996348.

The product of its digits is 22680, while the sum is 40.

The square root of 9981715 is about 3159.3852250082. The cubic root of 9981715 is about 215.3120760923.

The spelling of 9981715 in words is "nine million, nine hundred eighty-one thousand, seven hundred fifteen".