51442 has 12 divisors (see below), whose sum is σ = 82890. Its totient is φ = 23936.

The previous prime is 51439. The next prime is 51449. The reversal of 51442 is 24415.

51442 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 47961 + 3481 = 219^2 + 59^2 .

It is not an unprimeable number, because it can be changed into a prime (51449) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 534 + ... + 622.

2⁵¹⁴⁴² is an apocalyptic number.

51442 is a deficient number, since it is larger than the sum of its proper divisors (31448).

51442 is a wasteful number, since it uses less digits than its factorization.

51442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125 (or 108 counting only the distinct ones).

The product of its digits is 160, while the sum is 16.

The square root of 51442 is about 226.8082890901. The cubic root of 51442 is about 37.1911220962.

Adding to 51442 its reverse (24415), we get a palindrome (75857).

The spelling of 51442 in words is "fifty-one thousand, four hundred forty-two".