5661815 has 8 divisors (see below), whose sum is σ = 7028640. Its totient is φ = 4373152.

The previous prime is 5661811. The next prime is 5661823. The reversal of 5661815 is 5181665.

It is a happy number.

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 5661815 - 2² = 5661811 is a prime.

It is a super-2 number, since 2×5661815² = 64112298188450, which contains 22 as substring.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5661811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19379 + ... + 19668.

It is an arithmetic number, because the mean of its divisors is an integer number (878580).

Almost surely, 2^5661815 is an apocalyptic number.

5661815 is a deficient number, since it is larger than the sum of its proper divisors (1366825).

5661815 is a wasteful number, since it uses less digits than its factorization.

5661815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39081.

The product of its digits is 7200, while the sum is 32.

The square root of 5661815 is about 2379.4568708006. The cubic root of 5661815 is about 178.2318130269.

The spelling of 5661815 in words is "five million, six hundred sixty-one thousand, eight hundred fifteen".