5217521 has 4 divisors (see below), whose sum is σ = 5524452. Its totient is φ = 4910592.

The previous prime is 5217493. The next prime is 5217523. The reversal of 5217521 is 1257125.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4669921 + 547600 = 2161^2 + 740^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-5217521 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (5217523) 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, 153440 + ... + 153473.

It is an arithmetic number, because the mean of its divisors is an integer number (1381113).

Almost surely, 2^5217521 is an apocalyptic number.

It is an amenable number.

5217521 is a deficient number, since it is larger than the sum of its proper divisors (306931).

5217521 is a wasteful number, since it uses less digits than its factorization.

5217521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 306930.

The product of its digits is 700, while the sum is 23.

The square root of 5217521 is about 2284.1893529215. The cubic root of 5217521 is about 173.4421846691.

The spelling of 5217521 in words is "five million, two hundred seventeen thousand, five hundred twenty-one".