1669547189 has 4 divisors (see below), whose sum is σ = 1714670124. Its totient is φ = 1624424256.

The previous prime is 1669547177. The next prime is 1669547221. The reversal of 1669547189 is 9817459661.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 982320964 + 687226225 = 31342^2 + 26215^2 .

It is a cyclic number.

It is not a de Polignac number, because 1669547189 - 2²⁰ = 1668498613 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1669547149) 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, 22561412 + ... + 22561485.

It is an arithmetic number, because the mean of its divisors is an integer number (428667531).

Almost surely, 2^1669547189 is an apocalyptic number.

It is an amenable number.

1669547189 is a deficient number, since it is larger than the sum of its proper divisors (45122935).

1669547189 is an equidigital number, since it uses as much as digits as its factorization.

1669547189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45122934.

The product of its digits is 3265920, while the sum is 56.

The square root of 1669547189 is about 40860.0928657780. The cubic root of 1669547189 is about 1186.3137557408.

The spelling of 1669547189 in words is "one billion, six hundred sixty-nine million, five hundred forty-seven thousand, one hundred eighty-nine".