42851 has 4 divisors (see below), whose sum is σ = 43512. Its totient is φ = 42192.

The previous prime is 42841. The next prime is 42853. The reversal of 42851 is 15824.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 42851 - 2⁶ = 42787 is a prime.

It is a Duffinian number.

It is a plaindrome in base 14.

It is a nialpdrome in base 16.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 42851.

It is not an unprimeable number, because it can be changed into a prime (42853) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 221 + ... + 366.

It is an arithmetic number, because the mean of its divisors is an integer number (10878).

2⁴²⁸⁵¹ is an apocalyptic number.

42851 is a deficient number, since it is larger than the sum of its proper divisors (661).

42851 is an equidigital number, since it uses as much as digits as its factorization.

42851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 660.

The product of its digits is 320, while the sum is 20.

The square root of 42851 is about 207.0048308615. The cubic root of 42851 is about 34.9934681688.

The spelling of 42851 in words is "forty-two thousand, eight hundred fifty-one".