9661569 has 4 divisors (see below), whose sum is σ = 12882096. Its totient is φ = 6441044.

The previous prime is 9661567. The next prime is 9661571. The reversal of 9661569 is 9651669.

9661569 is digitally balanced in base 3, because in such base 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 an interprime number because it is at equal distance from previous prime (9661567) and next prime (9661571).

It is a cyclic number.

It is not a de Polignac number, because 9661569 - 2¹ = 9661567 is a prime.

It is a super-2 number, since 2×9661569² = 186691831083522, which contains 22 as substring.

9661569 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 9661569.

It is not an unprimeable number, because it can be changed into a prime (9661567) 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, 1610259 + ... + 1610264.

It is an arithmetic number, because the mean of its divisors is an integer number (3220524).

Almost surely, 2^9661569 is an apocalyptic number.

It is an amenable number.

9661569 is a deficient number, since it is larger than the sum of its proper divisors (3220527).

9661569 is a wasteful number, since it uses less digits than its factorization.

9661569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3220526.

The product of its digits is 87480, while the sum is 42.

The square root of 9661569 is about 3108.3064520732. The cubic root of 9661569 is about 212.9850989157.

The spelling of 9661569 in words is "nine million, six hundred sixty-one thousand, five hundred sixty-nine".