51316418 has 4 divisors (see below), whose sum is σ = 76974630. Its totient is φ = 25658208.

The previous prime is 51316411. The next prime is 51316423. The reversal of 51316418 is 81461315.

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., 45873529 + 5442889 = 6773^2 + 2333^2 .

It is not an unprimeable number, because it can be changed into a prime (51316411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12829103 + ... + 12829106.

Almost surely, 2^51316418 is an apocalyptic number.

51316418 is a deficient number, since it is larger than the sum of its proper divisors (25658212).

51316418 is a wasteful number, since it uses less digits than its factorization.

51316418 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25658211.

The product of its digits is 2880, while the sum is 29.

The square root of 51316418 is about 7163.5478640126. The cubic root of 51316418 is about 371.6083334844.

The spelling of 51316418 in words is "fifty-one million, three hundred sixteen thousand, four hundred eighteen".