52218261 has 12 divisors (see below), whose sum is σ = 75571392. Its totient is φ = 34745256.

The previous prime is 52218253. The next prime is 52218263. The reversal of 52218261 is 16281225.

It is a happy number.

52218261 is a `hidden beast` number, since 522 + 1 + 82 + 61 = 666.

52218261 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 52218261 - 2³ = 52218253 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (52218263) 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 11 ways as a sum of consecutive naturals, for example, 381 + ... + 10226.

It is an arithmetic number, because the mean of its divisors is an integer number (6297616).

Almost surely, 2^52218261 is an apocalyptic number.

It is an amenable number.

52218261 is a deficient number, since it is larger than the sum of its proper divisors (23353131).

52218261 is a wasteful number, since it uses less digits than its factorization.

52218261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11160 (or 11157 counting only the distinct ones).

The product of its digits is 1920, while the sum is 27.

The square root of 52218261 is about 7226.2203813612. The cubic root of 52218261 is about 373.7726057251.

Adding to 52218261 its reverse (16281225), we get a palindrome (68499486).

The spelling of 52218261 in words is "fifty-two million, two hundred eighteen thousand, two hundred sixty-one".