51651163 has 4 divisors (see below), whose sum is σ = 51678000. Its totient is φ = 51624328.

The previous prime is 51651161. The next prime is 51651181. The reversal of 51651163 is 36115615.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 36115615 = 5 ⋅7223123.

It is a cyclic number.

It is not a de Polignac number, because 51651163 - 2¹ = 51651161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51651161) 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, 10288 + ... + 14461.

It is an arithmetic number, because the mean of its divisors is an integer number (12919500).

Almost surely, 2^51651163 is an apocalyptic number.

51651163 is a deficient number, since it is larger than the sum of its proper divisors (26837).

51651163 is a wasteful number, since it uses less digits than its factorization.

51651163 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26836.

The product of its digits is 2700, while the sum is 28.

The square root of 51651163 is about 7186.8743553787. The cubic root of 51651163 is about 372.4146025879.

Adding to 51651163 its reverse (36115615), we get a palindrome (87766778).

It can be divided in two parts, 5165 and 1163, that added together give a triangular number (6328 = T₁₁₂).

The spelling of 51651163 in words is "fifty-one million, six hundred fifty-one thousand, one hundred sixty-three".