5661997 has 8 divisors (see below), whose sum is σ = 6194592. Its totient is φ = 5132400.

The previous prime is 5661991. The next prime is 5662039. The reversal of 5661997 is 7991665.

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

It is a cyclic number.

It is not a de Polignac number, because 5661997 - 2¹⁵ = 5629229 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 (5661991) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5547 + ... + 6487.

It is an arithmetic number, because the mean of its divisors is an integer number (774324).

Almost surely, 2^5661997 is an apocalyptic number.

It is an amenable number.

5661997 is a deficient number, since it is larger than the sum of its proper divisors (532595).

5661997 is a wasteful number, since it uses less digits than its factorization.

5661997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1499.

The product of its digits is 102060, while the sum is 43.

The square root of 5661997 is about 2379.4951145148. The cubic root of 5661997 is about 178.2337227704.

The spelling of 5661997 in words is "five million, six hundred sixty-one thousand, nine hundred ninety-seven".