609966091 has 4 divisors (see below), whose sum is σ = 697104112. Its totient is φ = 522828072.

The previous prime is 609966089. The next prime is 609966109. The reversal of 609966091 is 190669906.

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

It is a cyclic number.

It is not a de Polignac number, because 609966091 - 2¹ = 609966089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (609966391) 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, 43569000 + ... + 43569013.

It is an arithmetic number, because the mean of its divisors is an integer number (174276028).

Almost surely, 2^609966091 is an apocalyptic number.

609966091 is a deficient number, since it is larger than the sum of its proper divisors (87138021).

609966091 is an equidigital number, since it uses as much as digits as its factorization.

609966091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87138020.

The product of its (nonzero) digits is 157464, while the sum is 46.

The square root of 609966091 is about 24697.4915932772. The cubic root of 609966091 is about 848.0768938187.

The spelling of 609966091 in words is "six hundred nine million, nine hundred sixty-six thousand, ninety-one".