9691989 has 16 divisors (see below), whose sum is σ = 13919040. Its totient is φ = 5976320.

The previous prime is 9691987. The next prime is 9691999. The reversal of 9691989 is 9891969.

9691989 = 2² + 3² + ... + 307².

It is a cyclic number.

It is not a de Polignac number, because 9691989 - 2¹ = 9691987 is a prime.

It is a super-2 number, since 2×9691989² = 187869301552242, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9691987) 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 15 ways as a sum of consecutive naturals, for example, 1399 + ... + 4619.

It is an arithmetic number, because the mean of its divisors is an integer number (869940).

Almost surely, 2^9691989 is an apocalyptic number.

It is an amenable number.

9691989 is a deficient number, since it is larger than the sum of its proper divisors (4227051).

9691989 is a wasteful number, since it uses less digits than its factorization.

9691989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3300.

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

The square root of 9691989 is about 3113.1959462906. The cubic root of 9691989 is about 213.2083966271.

The spelling of 9691989 in words is "nine million, six hundred ninety-one thousand, nine hundred eighty-nine".