9661989 has 4 divisors (see below), whose sum is σ = 12882656. Its totient is φ = 6441324.

The previous prime is 9661979. The next prime is 9661991. The reversal of 9661989 is 9891669.

9661989 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

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.

It is not a de Polignac number, because 9661989 - 2⁵ = 9661957 is a prime.

It is a super-2 number, since 2×9661989² = 186708062872242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9661919) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1610329 + ... + 1610334.

It is an arithmetic number, because the mean of its divisors is an integer number (3220664).

Almost surely, 2^9661989 is an apocalyptic number.

It is an amenable number.

9661989 is a deficient number, since it is larger than the sum of its proper divisors (3220667).

9661989 is a wasteful number, since it uses less digits than its factorization.

9661989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3220666.

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

The square root of 9661989 is about 3108.3740122450. The cubic root of 9661989 is about 212.9881851103.

The spelling of 9661989 in words is "nine million, six hundred sixty-one thousand, nine hundred eighty-nine".