51271247 has 4 divisors (see below), whose sum is σ = 51285600. Its totient is φ = 51256896.

The previous prime is 51271223. The next prime is 51271267. The reversal of 51271247 is 74217215.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 74217215 = 5 ⋅14843443.

It is a cyclic number.

It is not a de Polignac number, because 51271247 - 2⁶ = 51271183 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 (51271267) 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, 2879 + ... + 10527.

It is an arithmetic number, because the mean of its divisors is an integer number (12821400).

Almost surely, 2^51271247 is an apocalyptic number.

51271247 is a deficient number, since it is larger than the sum of its proper divisors (14353).

51271247 is an equidigital number, since it uses as much as digits as its factorization.

51271247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14352.

The product of its digits is 3920, while the sum is 29.

The square root of 51271247 is about 7160.3943327166. The cubic root of 51271247 is about 371.4992660661.

The spelling of 51271247 in words is "fifty-one million, two hundred seventy-one thousand, two hundred forty-seven".