52220561 has 4 divisors (see below), whose sum is σ = 54021300. Its totient is φ = 50419824.

The previous prime is 52220551. The next prime is 52220573. The reversal of 52220561 is 16502225.

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 9186961 + 43033600 = 3031^2 + 6560^2 .

It is a cyclic number.

It is not a de Polignac number, because 52220561 - 2¹⁰ = 52219537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (52220551) 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, 900326 + ... + 900383.

It is an arithmetic number, because the mean of its divisors is an integer number (13505325).

Almost surely, 2^52220561 is an apocalyptic number.

It is an amenable number.

52220561 is a deficient number, since it is larger than the sum of its proper divisors (1800739).

52220561 is a wasteful number, since it uses less digits than its factorization.

52220561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1800738.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 52220561 is about 7226.3795222781. The cubic root of 52220561 is about 373.7780933607.

Adding to 52220561 its reverse (16502225), we get a palindrome (68722786).

The spelling of 52220561 in words is "fifty-two million, two hundred twenty thousand, five hundred sixty-one".