2129569 has 6 divisors (see below), whose sum is σ = 2306166. Its totient is φ = 1965600.

The previous prime is 2129551. The next prime is 2129579. The reversal of 2129569 is 9659212.

It can be written as a sum of positive squares in 3 ways, for example, as 12544 + 2117025 = 112^2 + 1455^2 .

It is not a de Polignac number, because 2129569 - 2⁵ = 2129537 is a prime.

It is a super-2 number, since 2×2129569² = 9070128251522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2129509) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6132 + ... + 6469.

It is an arithmetic number, because the mean of its divisors is an integer number (384361).

2^2129569 is an apocalyptic number.

It is an amenable number.

2129569 is a deficient number, since it is larger than the sum of its proper divisors (176597).

2129569 is a wasteful number, since it uses less digits than its factorization.

2129569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12627 (or 12614 counting only the distinct ones).

The product of its digits is 9720, while the sum is 34.

The square root of 2129569 is about 1459.3042862954. The cubic root of 2129569 is about 128.6561562046.

The spelling of 2129569 in words is "two million, one hundred twenty-nine thousand, five hundred sixty-nine".