52109621 has 4 divisors (see below), whose sum is σ = 52459500. Its totient is φ = 51759744.

The previous prime is 52109599. The next prime is 52109623. The reversal of 52109621 is 12690125.

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 12859396 + 39250225 = 3586^2 + 6265^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-52109621 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (52109623) 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, 174716 + ... + 175013.

It is an arithmetic number, because the mean of its divisors is an integer number (13114875).

Almost surely, 2^52109621 is an apocalyptic number.

It is an amenable number.

52109621 is a deficient number, since it is larger than the sum of its proper divisors (349879).

52109621 is a wasteful number, since it uses less digits than its factorization.

52109621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 349878.

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 52109621 is about 7218.6993980910. The cubic root of 52109621 is about 373.5132146718.

Adding to 52109621 its reverse (12690125), we get a palindrome (64799746).

The spelling of 52109621 in words is "fifty-two million, one hundred nine thousand, six hundred twenty-one".