2785091189 has 4 divisors (see below), whose sum is σ = 2801190156. Its totient is φ = 2768992224.

The previous prime is 2785091149. The next prime is 2785091191. The reversal of 2785091189 is 9811905872.

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 1090122289 + 1694968900 = 33017^2 + 41170^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2785091189 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 (2785091129) 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, 8049224 + ... + 8049569.

It is an arithmetic number, because the mean of its divisors is an integer number (700297539).

Almost surely, 2^2785091189 is an apocalyptic number.

It is an amenable number.

2785091189 is a deficient number, since it is larger than the sum of its proper divisors (16098967).

2785091189 is a wasteful number, since it uses less digits than its factorization.

2785091189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16098966.

The product of its (nonzero) digits is 362880, while the sum is 50.

The square root of 2785091189 is about 52773.9631731406. The cubic root of 2785091189 is about 1406.9537017172.

The spelling of 2785091189 in words is "two billion, seven hundred eighty-five million, ninety-one thousand, one hundred eighty-nine".