2169641689 has 4 divisors (see below), whose sum is σ = 2170920400. Its totient is φ = 2168362980.

The previous prime is 2169641659. The next prime is 2169641743. The reversal of 2169641689 is 9861469612.

It is a happy number.

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 2169641689 - 2⁵ = 2169641657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2169641659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 636807 + ... + 640204.

It is an arithmetic number, because the mean of its divisors is an integer number (542730100).

Almost surely, 2^2169641689 is an apocalyptic number.

It is an amenable number.

2169641689 is a deficient number, since it is larger than the sum of its proper divisors (1278711).

2169641689 is a wasteful number, since it uses less digits than its factorization.

2169641689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1278710.

The product of its digits is 1119744, while the sum is 52.

The square root of 2169641689 is about 46579.4127163493. The cubic root of 2169641689 is about 1294.5813286601.

The spelling of 2169641689 in words is "two billion, one hundred sixty-nine million, six hundred forty-one thousand, six hundred eighty-nine".