5217621 has 4 divisors (see below), whose sum is σ = 6956832. Its totient is φ = 3478412.

The previous prime is 5217607. The next prime is 5217631. The reversal of 5217621 is 1267125.

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 5217621 - 2⁶ = 5217557 is a prime.

It is a D-number.

5217621 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 5217591 and 5217600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5217601) 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, 869601 + ... + 869606.

It is an arithmetic number, because the mean of its divisors is an integer number (1739208).

Almost surely, 2^5217621 is an apocalyptic number.

It is an amenable number.

5217621 is a deficient number, since it is larger than the sum of its proper divisors (1739211).

5217621 is a wasteful number, since it uses less digits than its factorization.

5217621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1739210.

The product of its digits is 840, while the sum is 24.

The square root of 5217621 is about 2284.2112424205. The cubic root of 5217621 is about 173.4432927373.

The spelling of 5217621 in words is "five million, two hundred seventeen thousand, six hundred twenty-one".