51272218 has 4 divisors (see below), whose sum is σ = 76908330. Its totient is φ = 25636108.

The previous prime is 51272213. The next prime is 51272227. The reversal of 51272218 is 81227215.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 34845409 + 16426809 = 5903^2 + 4053^2 .

It is not an unprimeable number, because it can be changed into a prime (51272213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12818053 + ... + 12818056.

Almost surely, 2^51272218 is an apocalyptic number.

51272218 is a deficient number, since it is larger than the sum of its proper divisors (25636112).

51272218 is a wasteful number, since it uses less digits than its factorization.

51272218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25636111.

The product of its digits is 2240, while the sum is 28.

The square root of 51272218 is about 7160.4621359239. The cubic root of 51272218 is about 371.5016112630.

The spelling of 51272218 in words is "fifty-one million, two hundred seventy-two thousand, two hundred eighteen".