9981669 has 16 divisors (see below), whose sum is σ = 14834880. Its totient is φ = 5932800.

The previous prime is 9981661. The next prime is 9981689. The reversal of 9981669 is 9661899.

9981669 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 9981669 - 2³ = 9981661 is a prime.

It is a super-2 number, since 2×9981669² = 199267432051122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9981661) 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, 4182 + ... + 6119.

It is an arithmetic number, because the mean of its divisors is an integer number (927180).

Almost surely, 2^9981669 is an apocalyptic number.

It is an amenable number.

9981669 is a deficient number, since it is larger than the sum of its proper divisors (4853211).

9981669 is a wasteful number, since it uses less digits than its factorization.

9981669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10340.

The product of its digits is 209952, while the sum is 48.

The square root of 9981669 is about 3159.3779451025. The cubic root of 9981669 is about 215.3117453418.

The spelling of 9981669 in words is "nine million, nine hundred eighty-one thousand, six hundred sixty-nine".