51509163 has 8 divisors (see below), whose sum is σ = 69974928. Its totient is φ = 33691424.

The previous prime is 51509153. The next prime is 51509203. The reversal of 51509163 is 36190515.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 51509163 - 2⁴ = 51509147 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51509163.

It is not an unprimeable number, because it can be changed into a prime (51509153) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 161820 + ... + 162137.

It is an arithmetic number, because the mean of its divisors is an integer number (8746866).

Almost surely, 2^51509163 is an apocalyptic number.

51509163 is a gapful number since it is divisible by the number (53) formed by its first and last digit.

51509163 is a deficient number, since it is larger than the sum of its proper divisors (18465765).

51509163 is a wasteful number, since it uses less digits than its factorization.

51509163 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 324013.

The product of its (nonzero) digits is 4050, while the sum is 30.

The square root of 51509163 is about 7176.9884352700. The cubic root of 51509163 is about 372.0730071186.

Adding to 51509163 its reverse (36190515), we get a palindrome (87699678).

The spelling of 51509163 in words is "fifty-one million, five hundred nine thousand, one hundred sixty-three".