51816161 has 4 divisors (see below), whose sum is σ = 53021232. Its totient is φ = 50611092.

The previous prime is 51816151. The next prime is 51816181. The reversal of 51816161 is 16161815.

51816161 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51816161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51816151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 602471 + ... + 602556.

It is an arithmetic number, because the mean of its divisors is an integer number (13255308).

Almost surely, 2^51816161 is an apocalyptic number.

It is an amenable number.

51816161 is a deficient number, since it is larger than the sum of its proper divisors (1205071).

51816161 is a wasteful number, since it uses less digits than its factorization.

51816161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1205070.

The product of its digits is 1440, while the sum is 29.

The square root of 51816161 is about 7198.3443235233. The cubic root of 51816161 is about 372.8107366149.

Adding to 51816161 its reverse (16161815), we get a palindrome (67977976).

The spelling of 51816161 in words is "fifty-one million, eight hundred sixteen thousand, one hundred sixty-one".