51242218 has 4 divisors (see below), whose sum is σ = 76863330. Its totient is φ = 25621108.

The previous prime is 51242201. The next prime is 51242227. The reversal of 51242218 is 81224215.

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., 34374769 + 16867449 = 5863^2 + 4107^2 .

It is a junction number, because it is equal to n+sod(n) for n = 51242192 and 51242201.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12810553 + ... + 12810556.

Almost surely, 2^51242218 is an apocalyptic number.

51242218 is a deficient number, since it is larger than the sum of its proper divisors (25621112).

51242218 is a wasteful number, since it uses less digits than its factorization.

51242218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25621111.

The product of its digits is 1280, while the sum is 25.

The square root of 51242218 is about 7158.3669925480. The cubic root of 51242218 is about 371.4291404190.

The spelling of 51242218 in words is "fifty-one million, two hundred forty-two thousand, two hundred eighteen".