609718985 has 4 divisors (see below), whose sum is σ = 731662788. Its totient is φ = 487775184.

The previous prime is 609718981. The next prime is 609719003. The reversal of 609718985 is 589817906.

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 296287369 + 313431616 = 17213^2 + 17704^2 .

It is a cyclic number.

It is not a de Polignac number, because 609718985 - 2² = 609718981 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (609718981) 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, 60971894 + ... + 60971903.

It is an arithmetic number, because the mean of its divisors is an integer number (182915697).

Almost surely, 2^609718985 is an apocalyptic number.

It is an amenable number.

609718985 is a deficient number, since it is larger than the sum of its proper divisors (121943803).

609718985 is a wasteful number, since it uses less digits than its factorization.

609718985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121943802.

The product of its (nonzero) digits is 1088640, while the sum is 53.

The square root of 609718985 is about 24692.4884327198. The cubic root of 609718985 is about 847.9623556514.

The spelling of 609718985 in words is "six hundred nine million, seven hundred eighteen thousand, nine hundred eighty-five".