51861300 has 36 divisors (see below), whose sum is σ = 150052896. Its totient is φ = 13829600.

The previous prime is 51861289. The next prime is 51861319. The reversal of 51861300 is 316815.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 86136 + ... + 86735.

It is an arithmetic number, because the mean of its divisors is an integer number (4168136).

Almost surely, 2^51861300 is an apocalyptic number.

51861300 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

51861300 is an abundant number, since it is smaller than the sum of its proper divisors (98191596).

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

51861300 is a wasteful number, since it uses less digits than its factorization.

51861300 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172888 (or 172881 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 24.

The square root of 51861300 is about 7201.4790147580. The cubic root of 51861300 is about 372.9189616634.

Adding to 51861300 its product of nonzero digits (720), we get a triangular number (51862020 = T₁₀₁₈₄).

The spelling of 51861300 in words is "fifty-one million, eight hundred sixty-one thousand, three hundred".