51204218 has 16 divisors (see below), whose sum is σ = 82865160. Its totient is φ = 23589696.

The previous prime is 51204211. The next prime is 51204229. The reversal of 51204218 is 81240215.

It can be written as a sum of positive squares in 4 ways, for example, as 51165409 + 38809 = 7153^2 + 197^2 .

It is a junction number, because it is equal to n+sod(n) for n = 51204193 and 51204202.

It is not an unprimeable number, because it can be changed into a prime (51204211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16148 + ... + 19056.

Almost surely, 2^51204218 is an apocalyptic number.

51204218 is a deficient number, since it is larger than the sum of its proper divisors (31660942).

51204218 is a wasteful number, since it uses less digits than its factorization.

51204218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3601.

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

The square root of 51204218 is about 7155.7122636394. The cubic root of 51204218 is about 371.3373033995.

The spelling of 51204218 in words is "fifty-one million, two hundred four thousand, two hundred eighteen".