51279317 has 4 divisors (see below), whose sum is σ = 51460800. Its totient is φ = 51097836.

The previous prime is 51279307. The next prime is 51279329. The reversal of 51279317 is 71397215.

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: 71397215 = 5 ⋅14279443.

It is a cyclic number.

It is not a de Polignac number, because 51279317 - 2¹⁶ = 51213781 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 (51279307) 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, 90317 + ... + 90882.

It is an arithmetic number, because the mean of its divisors is an integer number (12865200).

Almost surely, 2^51279317 is an apocalyptic number.

It is an amenable number.

51279317 is a deficient number, since it is larger than the sum of its proper divisors (181483).

51279317 is a wasteful number, since it uses less digits than its factorization.

51279317 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 181482.

The product of its digits is 13230, while the sum is 35.

The square root of 51279317 is about 7160.9578269949. The cubic root of 51279317 is about 371.5187561440.

The spelling of 51279317 in words is "fifty-one million, two hundred seventy-nine thousand, three hundred seventeen".