51516418 has 16 divisors (see below), whose sum is σ = 80849664. Its totient is φ = 24593440.

The previous prime is 51516403. The next prime is 51516419. The reversal of 51516418 is 81461515.

It is a self number, because there is not a number n which added to its sum of digits gives 51516418.

It is not an unprimeable number, because it can be changed into a prime (51516419) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2830 + ... + 10537.

It is an arithmetic number, because the mean of its divisors is an integer number (5053104).

Almost surely, 2^51516418 is an apocalyptic number.

51516418 is a deficient number, since it is larger than the sum of its proper divisors (29333246).

51516418 is a wasteful number, since it uses less digits than its factorization.

51516418 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13457.

The product of its digits is 4800, while the sum is 31.

The square root of 51516418 is about 7177.4938523136. The cubic root of 51516418 is about 372.0904749682.

The spelling of 51516418 in words is "fifty-one million, five hundred sixteen thousand, four hundred eighteen".