51851812 has 12 divisors (see below), whose sum is σ = 91017136. Its totient is φ = 25846920.

The previous prime is 51851803. The next prime is 51851869. The reversal of 51851812 is 21815815.

It is a super-2 number, since 2×51851812² = 5377220815366688, which contains 22 as substring.

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

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 3 ways as a sum of consecutive naturals, for example, 18258 + ... + 20905.

Almost surely, 2^51851812 is an apocalyptic number.

It is an amenable number.

51851812 is a deficient number, since it is larger than the sum of its proper divisors (39165324).

51851812 is a wasteful number, since it uses less digits than its factorization.

51851812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39498 (or 39496 counting only the distinct ones).

The product of its digits is 3200, while the sum is 31.

The square root of 51851812 is about 7200.8202310570. The cubic root of 51851812 is about 372.8962184946.

The spelling of 51851812 in words is "fifty-one million, eight hundred fifty-one thousand, eight hundred twelve".