51171247 has 4 divisors (see below), whose sum is σ = 52361320. Its totient is φ = 49981176.

The previous prime is 51171229. The next prime is 51171257. The reversal of 51171247 is 74217115.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51171247 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 (51171257) 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, 594972 + ... + 595057.

It is an arithmetic number, because the mean of its divisors is an integer number (13090330).

Almost surely, 2^51171247 is an apocalyptic number.

51171247 is a deficient number, since it is larger than the sum of its proper divisors (1190073).

51171247 is a wasteful number, since it uses less digits than its factorization.

51171247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1190072.

The product of its digits is 1960, while the sum is 28.

The square root of 51171247 is about 7153.4080688858. The cubic root of 51171247 is about 371.2575834628.

The spelling of 51171247 in words is "fifty-one million, one hundred seventy-one thousand, two hundred forty-seven".