51206729 has 8 divisors (see below), whose sum is σ = 61602240. Its totient is φ = 41581296.

The previous prime is 51206711. The next prime is 51206777. The reversal of 51206729 is 92760215.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 51206729 - 2¹⁶ = 51141193 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 51206695 and 51206704.

It is not an unprimeable number, because it can be changed into a prime (51206429) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 192374 + ... + 192639.

It is an arithmetic number, because the mean of its divisors is an integer number (7700280).

Almost surely, 2^51206729 is an apocalyptic number.

It is an amenable number.

51206729 is a deficient number, since it is larger than the sum of its proper divisors (10395511).

51206729 is a wasteful number, since it uses less digits than its factorization.

51206729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 385039.

The product of its (nonzero) digits is 7560, while the sum is 32.

The square root of 51206729 is about 7155.8877157205. The cubic root of 51206729 is about 371.3433732948.

The spelling of 51206729 in words is "fifty-one million, two hundred six thousand, seven hundred twenty-nine".