2189209769 has 4 divisors (see below), whose sum is σ = 2189327700. Its totient is φ = 2189091840.

The previous prime is 2189209751. The next prime is 2189209777. The reversal of 2189209769 is 9679029812.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 493417369 + 1695792400 = 22213^2 + 41180^2 .

It is a cyclic number.

It is not a de Polignac number, because 2189209769 - 2²⁰ = 2188161193 is a prime.

It is a super-2 number, since 2×2189209769² = 9585278825370066722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2189209769.

It is not an unprimeable number, because it can be changed into a prime (2189509769) 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, 24344 + ... + 70505.

It is an arithmetic number, because the mean of its divisors is an integer number (547331925).

Almost surely, 2^2189209769 is an apocalyptic number.

It is an amenable number.

2189209769 is a deficient number, since it is larger than the sum of its proper divisors (117931).

2189209769 is an equidigital number, since it uses as much as digits as its factorization.

2189209769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117930.

The product of its (nonzero) digits is 979776, while the sum is 53.

The square root of 2189209769 is about 46788.9919639225. The cubic root of 2189209769 is about 1298.4616455931.

The spelling of 2189209769 in words is "two billion, one hundred eighty-nine million, two hundred nine thousand, seven hundred sixty-nine".