52113521 has 4 divisors (see below), whose sum is σ = 52169844. Its totient is φ = 52057200.

The previous prime is 52113491. The next prime is 52113527. The reversal of 52113521 is 12531125.

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 42719296 + 9394225 = 6536^2 + 3065^2 .

It is a cyclic number.

It is not a de Polignac number, because 52113521 - 2²² = 47919217 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 52113493 and 52113502.

It is not an unprimeable number, because it can be changed into a prime (52113527) 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, 26750 + ... + 28631.

It is an arithmetic number, because the mean of its divisors is an integer number (13042461).

Almost surely, 2^52113521 is an apocalyptic number.

It is an amenable number.

52113521 is a deficient number, since it is larger than the sum of its proper divisors (56323).

52113521 is an equidigital number, since it uses as much as digits as its factorization.

52113521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56322.

The product of its digits is 300, while the sum is 20.

The square root of 52113521 is about 7218.9695248006. The cubic root of 52113521 is about 373.5225326260.

Adding to 52113521 its reverse (12531125), we get a palindrome (64644646).

The spelling of 52113521 in words is "fifty-two million, one hundred thirteen thousand, five hundred twenty-one".