617385889 has 4 divisors (see below), whose sum is σ = 653702724. Its totient is φ = 581069056.

The previous prime is 617385883. The next prime is 617385931. The reversal of 617385889 is 988583716.

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 241336225 + 376049664 = 15535^2 + 19392^2 .

It is a cyclic number.

It is not a de Polignac number, because 617385889 - 2⁷ = 617385761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (617385883) 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, 18158392 + ... + 18158425.

It is an arithmetic number, because the mean of its divisors is an integer number (163425681).

Almost surely, 2^617385889 is an apocalyptic number.

It is an amenable number.

617385889 is a deficient number, since it is larger than the sum of its proper divisors (36316835).

617385889 is a wasteful number, since it uses less digits than its factorization.

617385889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36316834.

The product of its digits is 2903040, while the sum is 55.

The square root of 617385889 is about 24847.2511356890. The cubic root of 617385889 is about 851.5017921085.

The spelling of 617385889 in words is "six hundred seventeen million, three hundred eighty-five thousand, eight hundred eighty-nine".