51217705 has 16 divisors (see below), whose sum is σ = 76627584. Its totient is φ = 31927680.

The previous prime is 51217693. The next prime is 51217709. The reversal of 51217705 is 50771215.

It is not a de Polignac number, because 51217705 - 2⁹ = 51217193 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51217709) 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 15 ways as a sum of consecutive naturals, for example, 66132 + ... + 66901.

It is an arithmetic number, because the mean of its divisors is an integer number (4789224).

Almost surely, 2^51217705 is an apocalyptic number.

51217705 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

51217705 is a deficient number, since it is larger than the sum of its proper divisors (25409879).

51217705 is a wasteful number, since it uses less digits than its factorization.

51217705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133056.

The product of its (nonzero) digits is 2450, while the sum is 28.

The square root of 51217705 is about 7156.6545955495. The cubic root of 51217705 is about 371.3699034909.

The spelling of 51217705 in words is "fifty-one million, two hundred seventeen thousand, seven hundred five".