5661993 has 8 divisors (see below), whose sum is σ = 7564000. Its totient is φ = 3767328.

The previous prime is 5661991. The next prime is 5662039. The reversal of 5661993 is 3991665.

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

It is not a de Polignac number, because 5661993 - 2¹ = 5661991 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (5661991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 333 + ... + 3381.

It is an arithmetic number, because the mean of its divisors is an integer number (945500).

Almost surely, 2^5661993 is an apocalyptic number.

It is an amenable number.

5661993 is a deficient number, since it is larger than the sum of its proper divisors (1902007).

5661993 is a wasteful number, since it uses less digits than its factorization.

5661993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3671.

The product of its digits is 43740, while the sum is 39.

The square root of 5661993 is about 2379.4942740003. The cubic root of 5661993 is about 178.2336807984.

The spelling of 5661993 in words is "five million, six hundred sixty-one thousand, nine hundred ninety-three".