52116521 has 4 divisors (see below), whose sum is σ = 52491600. Its totient is φ = 51741444.

The previous prime is 52116517. The next prime is 52116523. The reversal of 52116521 is 12561125.

It is a happy number.

52116521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 52116521 - 2² = 52116517 is a prime.

It is a super-2 number, since 2×52116521² = 5432263522286882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (52116523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 187331 + ... + 187608.

It is an arithmetic number, because the mean of its divisors is an integer number (13122900).

Almost surely, 2^52116521 is an apocalyptic number.

It is an amenable number.

52116521 is a deficient number, since it is larger than the sum of its proper divisors (375079).

52116521 is a wasteful number, since it uses less digits than its factorization.

52116521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 375078.

The product of its digits is 600, while the sum is 23.

The square root of 52116521 is about 7219.1773076993. The cubic root of 52116521 is about 373.5296999668.

Adding to 52116521 its reverse (12561125), we get a palindrome (64677646).

The spelling of 52116521 in words is "fifty-two million, one hundred sixteen thousand, five hundred twenty-one".