51512171 has 4 divisors (see below), whose sum is σ = 51840432. Its totient is φ = 51183912.

The previous prime is 51512147. The next prime is 51512179. The reversal of 51512171 is 17121515.

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 51512171 - 2⁶ = 51512107 is a prime.

It is a super-2 number, since 2×51512171² = 5307007522266482, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51512179) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 163895 + ... + 164208.

It is an arithmetic number, because the mean of its divisors is an integer number (12960108).

Almost surely, 2^51512171 is an apocalyptic number.

51512171 is a deficient number, since it is larger than the sum of its proper divisors (328261).

51512171 is a wasteful number, since it uses less digits than its factorization.

51512171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 328260.

The product of its digits is 350, while the sum is 23.

The square root of 51512171 is about 7177.1979908597. The cubic root of 51512171 is about 372.0802496734.

Adding to 51512171 its reverse (17121515), we get a palindrome (68633686).

The spelling of 51512171 in words is "fifty-one million, five hundred twelve thousand, one hundred seventy-one".