2161569 has 8 divisors (see below), whose sum is σ = 2917152. Its totient is φ = 1423520.

The previous prime is 2161553. The next prime is 2161571. The reversal of 2161569 is 9651612.

2161569 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2161569 - 2⁴ = 2161553 is a prime.

It is a super-2 number, since 2×2161569² = 9344761083522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2161469) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4092 + ... + 4589.

It is an arithmetic number, because the mean of its divisors is an integer number (364644).

2^2161569 is an apocalyptic number.

It is an amenable number.

2161569 is a deficient number, since it is larger than the sum of its proper divisors (755583).

2161569 is an equidigital number, since it uses as much as digits as its factorization.

2161569 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8767.

The product of its digits is 3240, while the sum is 30.

The square root of 2161569 is about 1470.2275334111. The cubic root of 2161569 is about 129.2973729749.

The spelling of 2161569 in words is "two million, one hundred sixty-one thousand, five hundred sixty-nine".