6891609 has 4 divisors (see below), whose sum is σ = 9188816. Its totient is φ = 4594404.

The previous prime is 6891607. The next prime is 6891617. The reversal of 6891609 is 9061986.

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 not a de Polignac number, because 6891609 - 2¹ = 6891607 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6891601) 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, 1148599 + ... + 1148604.

It is an arithmetic number, because the mean of its divisors is an integer number (2297204).

Almost surely, 2^6891609 is an apocalyptic number.

It is an amenable number.

6891609 is a deficient number, since it is larger than the sum of its proper divisors (2297207).

6891609 is a wasteful number, since it uses less digits than its factorization.

6891609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2297206.

The product of its (nonzero) digits is 23328, while the sum is 39.

The square root of 6891609 is about 2625.1874218806. The cubic root of 6891609 is about 190.3006228955.

The spelling of 6891609 in words is "six million, eight hundred ninety-one thousand, six hundred nine".