51179717 has 4 divisors (see below), whose sum is σ = 51754860. Its totient is φ = 50604576.

The previous prime is 51179683. The next prime is 51179719. The reversal of 51179717 is 71797115.

It is a Cunningham number, because it is equal to 7154²+1.

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 9821956 + 41357761 = 3134^2 + 6431^2 .

It is a cyclic number.

It is not a de Polignac number, because 51179717 - 2¹⁰ = 51178693 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51179719) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 287438 + ... + 287615.

It is an arithmetic number, because the mean of its divisors is an integer number (12938715).

Almost surely, 2^51179717 is an apocalyptic number.

It is an amenable number.

51179717 is a deficient number, since it is larger than the sum of its proper divisors (575143).

51179717 is an equidigital number, since it uses as much as digits as its factorization.

51179717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 575142.

The product of its digits is 15435, while the sum is 38.

The square root of 51179717 is about 7154.0000698910. Note that the first 4 decimals coincide. The cubic root of 51179717 is about 371.2780661781.

The spelling of 51179717 in words is "fifty-one million, one hundred seventy-nine thousand, seven hundred seventeen".