42791 has 4 divisors (see below), whose sum is σ = 48912. Its totient is φ = 36672.

The previous prime is 42787. The next prime is 42793. The reversal of 42791 is 19724.

42791 is nontrivially palindromic in base 6.

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 42791 - 2² = 42787 is a prime.

It is a Duffinian number.

It is a plaindrome in base 8.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42793) 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, 3050 + ... + 3063.

It is an arithmetic number, because the mean of its divisors is an integer number (12228).

2⁴²⁷⁹¹ is an apocalyptic number.

42791 is a deficient number, since it is larger than the sum of its proper divisors (6121).

42791 is an equidigital number, since it uses as much as digits as its factorization.

42791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6120.

The product of its digits is 504, while the sum is 23.

The square root of 42791 is about 206.8598559412. The cubic root of 42791 is about 34.9771279138.

The spelling of 42791 in words is "forty-two thousand, seven hundred ninety-one".