9969981 has 16 divisors (see below), whose sum is σ = 15504000. Its totient is φ = 5696544.

The previous prime is 9969959. The next prime is 9970001. The reversal of 9969981 is 1899699.

It is not a de Polignac number, because 9969981 - 2⁷ = 9969853 is a prime.

It is a super-2 number, since 2×9969981² = 198801042280722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9969931) 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, 3816 + ... + 5873.

It is an arithmetic number, because the mean of its divisors is an integer number (969000).

Almost surely, 2^9969981 is an apocalyptic number.

It is an amenable number.

9969981 is a deficient number, since it is larger than the sum of its proper divisors (5534019).

9969981 is an equidigital number, since it uses as much as digits as its factorization.

9969981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9713 (or 9699 counting only the distinct ones).

The product of its digits is 314928, while the sum is 51.

The square root of 9969981 is about 3157.5276720878. The cubic root of 9969981 is about 215.2276730097.

The spelling of 9969981 in words is "nine million, nine hundred sixty-nine thousand, nine hundred eighty-one".