9910981 has 4 divisors (see below), whose sum is σ = 9919872. Its totient is φ = 9902092.

The previous prime is 9910973. The next prime is 9910993. The reversal of 9910981 is 1890199.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 9910981 - 2³ = 9910973 is a prime.

It is a super-2 number, since 2×9910981² = 196455088764722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 9910981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9910921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2485 + ... + 5098.

It is an arithmetic number, because the mean of its divisors is an integer number (2479968).

Almost surely, 2^9910981 is an apocalyptic number.

It is an amenable number.

9910981 is a deficient number, since it is larger than the sum of its proper divisors (8891).

9910981 is a wasteful number, since it uses less digits than its factorization.

9910981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8890.

The product of its (nonzero) digits is 5832, while the sum is 37.

The square root of 9910981 is about 3148.1710563437. The cubic root of 9910981 is about 214.8022772086.

The spelling of 9910981 in words is "nine million, nine hundred ten thousand, nine hundred eighty-one".