42251 has 8 divisors (see below), whose sum is σ = 48384. Its totient is φ = 36520.

The previous prime is 42239. The next prime is 42257. The reversal of 42251 is 15224.

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

It is not a de Polignac number, because 42251 - 2⁶ = 42187 is a prime.

It is a Duffinian number.

It is a plaindrome in base 14.

It is not an unprimeable number, because it can be changed into a prime (42257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 170 + ... + 336.

It is an arithmetic number, because the mean of its divisors is an integer number (6048).

2⁴²²⁵¹ is an apocalyptic number.

42251 is a deficient number, since it is larger than the sum of its proper divisors (6133).

42251 is a wasteful number, since it uses less digits than its factorization.

42251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201.

The product of its digits is 80, while the sum is 14.

The square root of 42251 is about 205.5504804178. The cubic root of 42251 is about 34.8293736230.

Adding to 42251 its reverse (15224), we get a palindrome (57475).

The spelling of 42251 in words is "forty-two thousand, two hundred fifty-one".