51605171 has 4 divisors (see below), whose sum is σ = 51914352. Its totient is φ = 51295992.

The previous prime is 51605161. The next prime is 51605189. The reversal of 51605171 is 17150615.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17150615 = 5 ⋅3430123.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51605171 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51605171.

It is not an unprimeable number, because it can be changed into a prime (51605131) 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, 154340 + ... + 154673.

It is an arithmetic number, because the mean of its divisors is an integer number (12978588).

Almost surely, 2^51605171 is an apocalyptic number.

51605171 is a deficient number, since it is larger than the sum of its proper divisors (309181).

51605171 is a wasteful number, since it uses less digits than its factorization.

51605171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 309180.

The product of its (nonzero) digits is 1050, while the sum is 26.

The square root of 51605171 is about 7183.6739207734. The cubic root of 51605171 is about 372.3040327721.

Adding to 51605171 its reverse (17150615), we get a palindrome (68755786).

The spelling of 51605171 in words is "fifty-one million, six hundred five thousand, one hundred seventy-one".