51280717 has 4 divisors (see below), whose sum is σ = 51929920. Its totient is φ = 50631516.

The previous prime is 51280711. The next prime is 51280741. The reversal of 51280717 is 71708215.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 71708215 = 5 ⋅14341643.

It is a cyclic number.

It is not a de Polignac number, because 51280717 - 2⁷ = 51280589 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 (51280711) 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, 324483 + ... + 324640.

It is an arithmetic number, because the mean of its divisors is an integer number (12982480).

Almost surely, 2^51280717 is an apocalyptic number.

It is an amenable number.

51280717 is a deficient number, since it is larger than the sum of its proper divisors (649203).

51280717 is an equidigital number, since it uses as much as digits as its factorization.

51280717 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 649202.

The product of its (nonzero) digits is 3920, while the sum is 31.

The square root of 51280717 is about 7161.0555786141. The cubic root of 51280717 is about 371.5221371142.

The spelling of 51280717 in words is "fifty-one million, two hundred eighty thousand, seven hundred seventeen".