51289100 has 18 divisors (see below), whose sum is σ = 111297564. Its totient is φ = 20515600.

The previous prime is 51289099. The next prime is 51289127. The reversal of 51289100 is 198215.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 51289100.

It is an unprimeable number.

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 in 5 ways as a sum of consecutive naturals, for example, 256346 + ... + 256545.

It is an arithmetic number, because the mean of its divisors is an integer number (6183198).

Almost surely, 2^51289100 is an apocalyptic number.

51289100 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

51289100 is an abundant number, since it is smaller than the sum of its proper divisors (60008464).

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

51289100 is a wasteful number, since it uses less digits than its factorization.

51289100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 512905 (or 512898 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 26.

The square root of 51289100 is about 7161.6408734312. The cubic root of 51289100 is about 371.5423805934.

The spelling of 51289100 in words is "fifty-one million, two hundred eighty-nine thousand, one hundred".