5661571 has 4 divisors (see below), whose sum is σ = 5666752. Its totient is φ = 5656392.

The previous prime is 5661559. The next prime is 5661587. The reversal of 5661571 is 1751665.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 5661571 - 2¹⁹ = 5137283 is a prime.

It is a Duffinian number.

5661571 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (5661521) 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 3 ways as a sum of consecutive naturals, for example, 240 + ... + 3373.

It is an arithmetic number, because the mean of its divisors is an integer number (1416688).

Almost surely, 2^5661571 is an apocalyptic number.

5661571 is a deficient number, since it is larger than the sum of its proper divisors (5181).

5661571 is a wasteful number, since it uses less digits than its factorization.

5661571 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5180.

The product of its digits is 6300, while the sum is 31.

The square root of 5661571 is about 2379.4055980433. The cubic root of 5661571 is about 178.2292526473.

The spelling of 5661571 in words is "five million, six hundred sixty-one thousand, five hundred seventy-one".