5665021 has 4 divisors (see below), whose sum is σ = 5963200. Its totient is φ = 5366844.

The previous prime is 5665013. The next prime is 5665027. The reversal of 5665021 is 1205665.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 5665021 - 2³ = 5665013 is a prime.

It is a Duffinian number.

It is a plaindrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5665027) 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, 149061 + ... + 149098.

It is an arithmetic number, because the mean of its divisors is an integer number (1490800).

Almost surely, 2^5665021 is an apocalyptic number.

It is an amenable number.

5665021 is a deficient number, since it is larger than the sum of its proper divisors (298179).

5665021 is a wasteful number, since it uses less digits than its factorization.

5665021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 298178.

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 5665021 is about 2380.1304586094. The cubic root of 5665021 is about 178.2654479051.

The spelling of 5665021 in words is "five million, six hundred sixty-five thousand, twenty-one".