51171009 has 16 divisors (see below), whose sum is σ = 73001280. Its totient is φ = 31786560.

The previous prime is 51170939. The next prime is 51171011. The reversal of 51171009 is 90017115.

It is not a de Polignac number, because 51171009 - 2⁷ = 51170881 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51171009.

It is not an unprimeable number, because it can be changed into a prime (51171019) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3882 + ... + 10835.

It is an arithmetic number, because the mean of its divisors is an integer number (4562580).

Almost surely, 2^51171009 is an apocalyptic number.

It is an amenable number.

51171009 is a deficient number, since it is larger than the sum of its proper divisors (21830271).

51171009 is a wasteful number, since it uses less digits than its factorization.

51171009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14800.

The product of its (nonzero) digits is 315, while the sum is 24.

The square root of 51171009 is about 7153.3914334391. The cubic root of 51171009 is about 371.2570078828.

The spelling of 51171009 in words is "fifty-one million, one hundred seventy-one thousand, nine".