51171651 has 6 divisors (see below), whose sum is σ = 73914620. Its totient is φ = 34114428.

The previous prime is 51171583. The next prime is 51171691. The reversal of 51171651 is 15617115.

It is a happy number.

51171651 is a `hidden beast` number, since 5 + 1 + 1 + 7 + 1 + 651 = 666.

It is not a de Polignac number, because 51171651 - 2¹⁰ = 51170627 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51171691) 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 5 ways as a sum of consecutive naturals, for example, 2842861 + ... + 2842878.

Almost surely, 2^51171651 is an apocalyptic number.

51171651 is a deficient number, since it is larger than the sum of its proper divisors (22742969).

51171651 is a wasteful number, since it uses less digits than its factorization.

51171651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5685745 (or 5685742 counting only the distinct ones).

The product of its digits is 1050, while the sum is 27.

The square root of 51171651 is about 7153.4363071184. The cubic root of 51171651 is about 371.2585604937.

Adding to 51171651 its reverse (15617115), we get a palindrome (66788766).

The spelling of 51171651 in words is "fifty-one million, one hundred seventy-one thousand, six hundred fifty-one".