51218204 has 6 divisors (see below), whose sum is σ = 89631864. Its totient is φ = 25609100.

The previous prime is 51218201. The next prime is 51218213. The reversal of 51218204 is 40281215.

It is a self number, because there is not a number n which added to its sum of digits gives 51218204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51218201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6402272 + ... + 6402279.

It is an arithmetic number, because the mean of its divisors is an integer number (14938644).

Almost surely, 2^51218204 is an apocalyptic number.

It is an amenable number.

51218204 is a deficient number, since it is larger than the sum of its proper divisors (38413660).

51218204 is a wasteful number, since it uses less digits than its factorization.

51218204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12804555 (or 12804553 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 23.

The square root of 51218204 is about 7156.6894581224. The cubic root of 51218204 is about 371.3711095385.

Adding to 51218204 its reverse (40281215), we get a palindrome (91499419).

The spelling of 51218204 in words is "fifty-one million, two hundred eighteen thousand, two hundred four".