51000729 has 16 divisors (see below), whose sum is σ = 76417152. Its totient is φ = 30019968.

The previous prime is 51000727. The next prime is 51000737. The reversal of 51000729 is 92700015.

It is not a de Polignac number, because 51000729 - 2¹ = 51000727 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 51000699 and 51000708.

It is not an unprimeable number, because it can be changed into a prime (51000727) 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, 27532 + ... + 29325.

It is an arithmetic number, because the mean of its divisors is an integer number (4776072).

Almost surely, 2^51000729 is an apocalyptic number.

It is an amenable number.

51000729 is a deficient number, since it is larger than the sum of its proper divisors (25416423).

51000729 is a wasteful number, since it uses less digits than its factorization.

51000729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56896.

The product of its (nonzero) digits is 630, while the sum is 24.

The square root of 51000729 is about 7141.4794685695. The cubic root of 51000729 is about 370.8447438759.

The spelling of 51000729 in words is "fifty-one million, seven hundred twenty-nine", and thus it is an aban number.