5128521 has 4 divisors (see below), whose sum is σ = 6838032. Its totient is φ = 3419012.

The previous prime is 5128511. The next prime is 5128523. The reversal of 5128521 is 1258215.

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 5128521 - 2⁵ = 5128489 is a prime.

It is a D-number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 5128491 and 5128500.

It is not an unprimeable number, because it can be changed into a prime (5128523) 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, 854751 + ... + 854756.

It is an arithmetic number, because the mean of its divisors is an integer number (1709508).

Almost surely, 2^5128521 is an apocalyptic number.

It is an amenable number.

5128521 is a deficient number, since it is larger than the sum of its proper divisors (1709511).

5128521 is a wasteful number, since it uses less digits than its factorization.

5128521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1709510.

The product of its digits is 800, while the sum is 24.

The square root of 5128521 is about 2264.6238098192. The cubic root of 5128521 is about 172.4503364697.

The spelling of 5128521 in words is "five million, one hundred twenty-eight thousand, five hundred twenty-one".