52013561 has 4 divisors (see below), whose sum is σ = 52473972. Its totient is φ = 51553152.

The previous prime is 52013551. The next prime is 52013569. The reversal of 52013561 is 16531025.

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 7123561 + 44890000 = 2669^2 + 6700^2 .

It is a cyclic number.

It is not a de Polignac number, because 52013561 - 2⁶ = 52013497 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 (52013569) 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, 230036 + ... + 230261.

It is an arithmetic number, because the mean of its divisors is an integer number (13118493).

Almost surely, 2^52013561 is an apocalyptic number.

It is an amenable number.

52013561 is a deficient number, since it is larger than the sum of its proper divisors (460411).

52013561 is a wasteful number, since it uses less digits than its factorization.

52013561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 460410.

The product of its (nonzero) digits is 900, while the sum is 23.

The square root of 52013561 is about 7212.0427758022. The cubic root of 52013561 is about 373.2835593896.

Adding to 52013561 its reverse (16531025), we get a palindrome (68544586).

The spelling of 52013561 in words is "fifty-two million, thirteen thousand, five hundred sixty-one".