51521171 has 12 divisors (see below), whose sum is σ = 56476728. Its totient is φ = 46972224.

The previous prime is 51521161. The next prime is 51521177. The reversal of 51521171 is 17112515.

It is not a de Polignac number, because 51521171 - 2¹⁴ = 51504787 is a prime.

It is a super-2 number, since 2×51521171² = 5308862122422482, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51521177) 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 11 ways as a sum of consecutive naturals, for example, 12191 + ... + 15863.

It is an arithmetic number, because the mean of its divisors is an integer number (4706394).

Almost surely, 2^51521171 is an apocalyptic number.

51521171 is a deficient number, since it is larger than the sum of its proper divisors (4955557).

51521171 is a wasteful number, since it uses less digits than its factorization.

51521171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3782 (or 3769 counting only the distinct ones).

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

The square root of 51521171 is about 7177.8249491054. The cubic root of 51521171 is about 372.1019178681.

Adding to 51521171 its reverse (17112515), we get a palindrome (68633686).

The spelling of 51521171 in words is "fifty-one million, five hundred twenty-one thousand, one hundred seventy-one".