51020171 has 4 divisors (see below), whose sum is σ = 51104832. Its totient is φ = 50935512.

The previous prime is 51020161. The next prime is 51020173. The reversal of 51020171 is 17102015.

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

It is a cyclic number.

It is not a de Polignac number, because 51020171 - 2⁶ = 51020107 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51020173) 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, 41420 + ... + 42633.

It is an arithmetic number, because the mean of its divisors is an integer number (12776208).

Almost surely, 2^51020171 is an apocalyptic number.

51020171 is a deficient number, since it is larger than the sum of its proper divisors (84661).

51020171 is an equidigital number, since it uses as much as digits as its factorization.

51020171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84660.

The product of its (nonzero) digits is 70, while the sum is 17.

The square root of 51020171 is about 7142.8405414093. The cubic root of 51020171 is about 370.8918611602.

Adding to 51020171 its reverse (17102015), we get a palindrome (68122186).

The spelling of 51020171 in words is "fifty-one million, twenty thousand, one hundred seventy-one".