5668921 has 4 divisors (see below), whose sum is σ = 5674212. Its totient is φ = 5663632.

The previous prime is 5668919. The next prime is 5668951. The reversal of 5668921 is 1298665.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1298665 = 5 ⋅259733.

It can be written as a sum of positive squares in 2 ways, for example, as 2134521 + 3534400 = 1461^2 + 1880^2 .

It is a cyclic number.

It is not a de Polignac number, because 5668921 - 2¹ = 5668919 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5668951) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 406 + ... + 3391.

It is an arithmetic number, because the mean of its divisors is an integer number (1418553).

Almost surely, 2^5668921 is an apocalyptic number.

It is an amenable number.

5668921 is a deficient number, since it is larger than the sum of its proper divisors (5291).

5668921 is a wasteful number, since it uses less digits than its factorization.

5668921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5290.

The product of its digits is 25920, while the sum is 37.

The square root of 5668921 is about 2380.9496004746. The cubic root of 5668921 is about 178.3063465923.

The spelling of 5668921 in words is "five million, six hundred sixty-eight thousand, nine hundred twenty-one".