609945605 has 4 divisors (see below), whose sum is σ = 731934732. Its totient is φ = 487956480.

The previous prime is 609945577. The next prime is 609945613. The reversal of 609945605 is 506549906.

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 471671524 + 138274081 = 21718^2 + 11759^2 .

It is not a de Polignac number, because 609945605 - 2²² = 605751301 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60994556 + ... + 60994565.

It is an arithmetic number, because the mean of its divisors is an integer number (182983683).

Almost surely, 2^609945605 is an apocalyptic number.

It is an amenable number.

609945605 is a deficient number, since it is larger than the sum of its proper divisors (121989127).

609945605 is a wasteful number, since it uses less digits than its factorization.

609945605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121989126.

The product of its (nonzero) digits is 291600, while the sum is 44.

The square root of 609945605 is about 24697.0768513199. The cubic root of 609945605 is about 848.0673993577.

The spelling of 609945605 in words is "six hundred nine million, nine hundred forty-five thousand, six hundred five".