9561989 has 2 divisors, whose sum is σ = 9561990. Its totient is φ = 9561988.

The previous prime is 9561983. The next prime is 9561991. The reversal of 9561989 is 9891659.

9561989 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5428900 + 4133089 = 2330^2 + 2033^2 .

It is a cyclic number.

It is not a de Polignac number, because 9561989 - 2¹⁶ = 9496453 is a prime.

It is a super-2 number, since 2×9561989² = 182863267272242, which contains 22 as substring.

Together with 9561991, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9561983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4780994 + 4780995.

It is an arithmetic number, because the mean of its divisors is an integer number (4780995).

Almost surely, 2^9561989 is an apocalyptic number.

It is an amenable number.

9561989 is a deficient number, since it is larger than the sum of its proper divisors (1).

9561989 is an equidigital number, since it uses as much as digits as its factorization.

9561989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 174960, while the sum is 47.

The square root of 9561989 is about 3092.2465943065. The cubic root of 9561989 is about 212.2508378377.

The spelling of 9561989 in words is "nine million, five hundred sixty-one thousand, nine hundred eighty-nine".