5661985 has 8 divisors (see below), whose sum is σ = 7765056. Its totient is φ = 3882480.

The previous prime is 5661973. The next prime is 5661991. The reversal of 5661985 is 5891665.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 5661985 - 2¹¹ = 5659937 is a prime.

It is a Duffinian number.

5661985 is a lucky number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 80851 + ... + 80920.

It is an arithmetic number, because the mean of its divisors is an integer number (970632).

Almost surely, 2^5661985 is an apocalyptic number.

It is an amenable number.

5661985 is a deficient number, since it is larger than the sum of its proper divisors (2103071).

5661985 is a wasteful number, since it uses less digits than its factorization.

5661985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161783.

The product of its digits is 64800, while the sum is 40.

The square root of 5661985 is about 2379.4925929702. The cubic root of 5661985 is about 178.2335968545.

The spelling of 5661985 in words is "five million, six hundred sixty-one thousand, nine hundred eighty-five".