51442161 has 4 divisors (see below), whose sum is σ = 68589552. Its totient is φ = 34294772.

The previous prime is 51442133. The next prime is 51442163. The reversal of 51442161 is 16124415.

It is a happy number.

51442161 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 not a de Polignac number, because 51442161 - 2⁵ = 51442129 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51442163) 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, 8573691 + ... + 8573696.

It is an arithmetic number, because the mean of its divisors is an integer number (17147388).

Almost surely, 2^51442161 is an apocalyptic number.

It is an amenable number.

51442161 is a deficient number, since it is larger than the sum of its proper divisors (17147391).

51442161 is a wasteful number, since it uses less digits than its factorization.

51442161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17147390.

The product of its digits is 960, while the sum is 24.

The square root of 51442161 is about 7172.3190810225. The cubic root of 51442161 is about 371.9116089563.

Adding to 51442161 its reverse (16124415), we get a palindrome (67566576).

The spelling of 51442161 in words is "fifty-one million, four hundred forty-two thousand, one hundred sixty-one".