9906981 has 16 divisors (see below), whose sum is σ = 15158784. Its totient is φ = 5637744.

The previous prime is 9906973. The next prime is 9906983. The reversal of 9906981 is 1896099.

9906981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 9906981 - 2³ = 9906973 is a prime.

It is a super-2 number, since 2×9906981² = 196296545068722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9906983) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5110 + ... + 6776.

It is an arithmetic number, because the mean of its divisors is an integer number (947424).

Almost surely, 2^9906981 is an apocalyptic number.

It is an amenable number.

9906981 is a deficient number, since it is larger than the sum of its proper divisors (5251803).

9906981 is a wasteful number, since it uses less digits than its factorization.

9906981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1960.

The product of its (nonzero) digits is 34992, while the sum is 42.

The square root of 9906981 is about 3147.5357027363. The cubic root of 9906981 is about 214.7733757734.

The spelling of 9906981 in words is "nine million, nine hundred six thousand, nine hundred eighty-one".