51272279 has 4 divisors (see below), whose sum is σ = 53970840. Its totient is φ = 48573720.

The previous prime is 51272251. The next prime is 51272293. The reversal of 51272279 is 97227215.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 97227215 = 5 ⋅19445443.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51272279 is a prime.

It is a Duffinian number.

It is a plaindrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51272209) 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, 1349252 + ... + 1349289.

It is an arithmetic number, because the mean of its divisors is an integer number (13492710).

Almost surely, 2^51272279 is an apocalyptic number.

51272279 is a deficient number, since it is larger than the sum of its proper divisors (2698561).

51272279 is a wasteful number, since it uses less digits than its factorization.

51272279 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2698560.

The product of its digits is 17640, while the sum is 35.

The square root of 51272279 is about 7160.4663954243. The cubic root of 51272279 is about 371.5017585916.

The spelling of 51272279 in words is "fifty-one million, two hundred seventy-two thousand, two hundred seventy-nine".