51276809 has 4 divisors (see below), whose sum is σ = 51292416. Its totient is φ = 51261204.

The previous prime is 51276793. The next prime is 51276817. The reversal of 51276809 is 90867215.

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.

It is a cyclic number.

It is not a de Polignac number, because 51276809 - 2⁴ = 51276793 is a prime.

It is a super-2 number, since 2×51276809² = 5258622282444962, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51276899) 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 3 ways as a sum of consecutive naturals, for example, 749 + ... + 10154.

It is an arithmetic number, because the mean of its divisors is an integer number (12823104).

Almost surely, 2^51276809 is an apocalyptic number.

It is an amenable number.

51276809 is a deficient number, since it is larger than the sum of its proper divisors (15607).

51276809 is a wasteful number, since it uses less digits than its factorization.

51276809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15606.

The product of its (nonzero) digits is 30240, while the sum is 38.

The square root of 51276809 is about 7160.7827086150. The cubic root of 51276809 is about 371.5126992236.

The spelling of 51276809 in words is "fifty-one million, two hundred seventy-six thousand, eight hundred nine".