42291 has 12 divisors (see below), whose sum is σ = 63232. Its totient is φ = 27216.

The previous prime is 42283. The next prime is 42293. The reversal of 42291 is 19224.

42291 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 42291 - 2³ = 42283 is a prime.

It is a Duffinian number.

It is a plaindrome in base 14.

It is a nialpdrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (42293) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 270 + ... + 396.

2⁴²²⁹¹ is an apocalyptic number.

42291 is a deficient number, since it is larger than the sum of its proper divisors (20941).

42291 is a wasteful number, since it uses less digits than its factorization.

42291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170 (or 167 counting only the distinct ones).

The product of its digits is 144, while the sum is 18.

The square root of 42291 is about 205.6477570994. The cubic root of 42291 is about 34.8403614145.

It can be divided in two parts, 42 and 291, that added together give a palindrome (333).

The spelling of 42291 in words is "forty-two thousand, two hundred ninety-one".