51718705 has 4 divisors (see below), whose sum is σ = 62062452. Its totient is φ = 41374960.

The previous prime is 51718691. The next prime is 51718721. The reversal of 51718705 is 50781715.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 21939856 + 29778849 = 4684^2 + 5457^2 .

It is not a de Polignac number, because 51718705 - 2⁵ = 51718673 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 5171866 + ... + 5171875.

It is an arithmetic number, because the mean of its divisors is an integer number (15515613).

Almost surely, 2^51718705 is an apocalyptic number.

It is an amenable number.

51718705 is a deficient number, since it is larger than the sum of its proper divisors (10343747).

51718705 is a wasteful number, since it uses less digits than its factorization.

51718705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10343746.

The product of its (nonzero) digits is 9800, while the sum is 34.

The square root of 51718705 is about 7191.5718031596. The cubic root of 51718705 is about 372.5768620575.

The spelling of 51718705 in words is "fifty-one million, seven hundred eighteen thousand, seven hundred five".