51291705 has 16 divisors (see below), whose sum is σ = 82163520. Its totient is φ = 27323328.

The previous prime is 51291683. The next prime is 51291707. The reversal of 51291705 is 50719215.

51291705 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 51291705 - 2⁵ = 51291673 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51291707) 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 15 ways as a sum of consecutive naturals, for example, 16786 + ... + 19604.

It is an arithmetic number, because the mean of its divisors is an integer number (5135220).

Almost surely, 2^51291705 is an apocalyptic number.

It is an amenable number.

51291705 is a deficient number, since it is larger than the sum of its proper divisors (30871815).

51291705 is a wasteful number, since it uses less digits than its factorization.

51291705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4040.

The product of its (nonzero) digits is 3150, while the sum is 30.

The square root of 51291705 is about 7161.8227428498. The cubic root of 51291705 is about 371.5486707637.

The spelling of 51291705 in words is "fifty-one million, two hundred ninety-one thousand, seven hundred five".