51171047 has 4 divisors (see below), whose sum is σ = 53864280. Its totient is φ = 48477816.

The previous prime is 51171019. The next prime is 51171073. The reversal of 51171047 is 74017115.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74017115 = 5 ⋅14803423.

It is not a de Polignac number, because 51171047 - 2¹⁰ = 51170023 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 (51171017) 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, 1346588 + ... + 1346625.

It is an arithmetic number, because the mean of its divisors is an integer number (13466070).

Almost surely, 2^51171047 is an apocalyptic number.

51171047 is a deficient number, since it is larger than the sum of its proper divisors (2693233).

51171047 is a wasteful number, since it uses less digits than its factorization.

51171047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2693232.

The product of its (nonzero) digits is 980, while the sum is 26.

The square root of 51171047 is about 7153.3940895214. The cubic root of 51171047 is about 371.2570997822.

The spelling of 51171047 in words is "fifty-one million, one hundred seventy-one thousand, forty-seven".