51709727 has 4 divisors (see below), whose sum is σ = 53958000. Its totient is φ = 49461456.

The previous prime is 51709717. The next prime is 51709739. The reversal of 51709727 is 72790715.

51709727 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 72790715 = 5 ⋅14558143.

It is a cyclic number.

It is not a de Polignac number, because 51709727 - 2⁴ = 51709711 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51709717) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1124102 + ... + 1124147.

It is an arithmetic number, because the mean of its divisors is an integer number (13489500).

Almost surely, 2^51709727 is an apocalyptic number.

51709727 is a deficient number, since it is larger than the sum of its proper divisors (2248273).

51709727 is a wasteful number, since it uses less digits than its factorization.

51709727 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2248272.

The product of its (nonzero) digits is 30870, while the sum is 38.

The square root of 51709727 is about 7190.9475731645. The cubic root of 51709727 is about 372.5553019106. Note that the first 3 decimals are identical.

The spelling of 51709727 in words is "fifty-one million, seven hundred nine thousand, seven hundred twenty-seven".