51289518 has 32 divisors (see below), whose sum is σ = 118653696. Its totient is φ = 14476608.

The previous prime is 51289501. The next prime is 51289519. The reversal of 51289518 is 81598215.

It is a super-2 number, since 2×51289518² = 5261229313344648, which contains 22 as substring.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51289519) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3871 + ... + 10842.

It is an arithmetic number, because the mean of its divisors is an integer number (3707928).

Almost surely, 2^51289518 is an apocalyptic number.

51289518 is an abundant number, since it is smaller than the sum of its proper divisors (67364178).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51289518 is a wasteful number, since it uses less digits than its factorization.

51289518 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14808.

The product of its digits is 28800, while the sum is 39.

The square root of 51289518 is about 7161.6700566279. The cubic root of 51289518 is about 371.5433899326.

The spelling of 51289518 in words is "fifty-one million, two hundred eighty-nine thousand, five hundred eighteen".