2165629 has 4 divisors (see below), whose sum is σ = 2235520. Its totient is φ = 2095740.

The previous prime is 2165617. The next prime is 2165651. The reversal of 2165629 is 9265612.

2165629 is digitally balanced in base 2, 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 a cyclic number.

It is not a de Polignac number, because 2165629 - 2⁹ = 2165117 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31), and also a Moran number because the ratio is a prime number: 69859 = 2165629 / (2 + 1 + 6 + 5 + 6 + 2 + 9).

It is a Duffinian number.

It is a nialpdrome in base 12.

It is a self number, because there is not a number n which added to its sum of digits gives 2165629.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2165659) 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 3 ways as a sum of consecutive naturals, for example, 34899 + ... + 34960.

It is an arithmetic number, because the mean of its divisors is an integer number (558880).

2^2165629 is an apocalyptic number.

It is an amenable number.

2165629 is a deficient number, since it is larger than the sum of its proper divisors (69891).

2165629 is an equidigital number, since it uses as much as digits as its factorization.

2165629 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69890.

The product of its digits is 6480, while the sum is 31.

The square root of 2165629 is about 1471.6076243347. The cubic root of 2165629 is about 129.3782739337.

The spelling of 2165629 in words is "two million, one hundred sixty-five thousand, six hundred twenty-nine".