51000085 has 32 divisors (see below), whose sum is σ = 71228160. Its totient is φ = 34771968.

The previous prime is 51000083. The next prime is 51000113. The reversal of 51000085 is 58000015.

It is a cyclic number.

It is not a de Polignac number, because 51000085 - 2¹ = 51000083 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51000083) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 36459 + ... + 37831.

It is an arithmetic number, because the mean of its divisors is an integer number (2225880).

Almost surely, 2^51000085 is an apocalyptic number.

It is an amenable number.

51000085 is a deficient number, since it is larger than the sum of its proper divisors (20228075).

51000085 is a wasteful number, since it uses less digits than its factorization.

51000085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1437.

The product of its (nonzero) digits is 200, while the sum is 19.

The square root of 51000085 is about 7141.4343797307. The cubic root of 51000085 is about 370.8431829504.

The spelling of 51000085 in words is "fifty-one million, eighty-five", and thus it is an aban number and an uban number.