617109989 has 4 divisors (see below), whose sum is σ = 618696780. Its totient is φ = 615523200.

The previous prime is 617109943. The next prime is 617109991. The reversal of 617109989 is 989901716.

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 43890625 + 573219364 = 6625^2 + 23942^2 .

It is a cyclic number.

It is not a de Polignac number, because 617109989 - 2²⁴ = 600332773 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (617109929) 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, 792812 + ... + 793589.

It is an arithmetic number, because the mean of its divisors is an integer number (154674195).

Almost surely, 2^617109989 is an apocalyptic number.

It is an amenable number.

617109989 is a deficient number, since it is larger than the sum of its proper divisors (1586791).

617109989 is a wasteful number, since it uses less digits than its factorization.

617109989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1586790.

The product of its (nonzero) digits is 244944, while the sum is 50.

The square root of 617109989 is about 24841.6985932927. The cubic root of 617109989 is about 851.3749323099.

The spelling of 617109989 in words is "six hundred seventeen million, one hundred nine thousand, nine hundred eighty-nine".