5666121 has 6 divisors (see below), whose sum is σ = 8184410. Its totient is φ = 3777408.

The previous prime is 5666093. The next prime is 5666131. The reversal of 5666121 is 1216665.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 3370896 + 2295225 = 1836^2 + 1515^2 .

It is not a de Polignac number, because 5666121 - 2⁷ = 5665993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5666131) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 314776 + ... + 314793.

Almost surely, 2^5666121 is an apocalyptic number.

It is an amenable number.

5666121 is a deficient number, since it is larger than the sum of its proper divisors (2518289).

5666121 is a wasteful number, since it uses less digits than its factorization.

5666121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 629575 (or 629572 counting only the distinct ones).

The product of its digits is 2160, while the sum is 27.

The square root of 5666121 is about 2380.3615271635. The cubic root of 5666121 is about 178.2769853323.

It can be divided in two parts, 5666 and 121, that multiplied together give a palindrome (685586).

The spelling of 5666121 in words is "five million, six hundred sixty-six thousand, one hundred twenty-one".