42511 has 4 divisors (see below), whose sum is σ = 48592. Its totient is φ = 36432.

The previous prime is 42509. The next prime is 42533. The reversal of 42511 is 11524.

42511 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 42511 - 2¹ = 42509 is a prime.

It is a Duffinian number.

42511 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 42491 and 42500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42571) 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, 3030 + ... + 3043.

It is an arithmetic number, because the mean of its divisors is an integer number (12148).

2⁴²⁵¹¹ is an apocalyptic number.

42511 is a deficient number, since it is larger than the sum of its proper divisors (6081).

42511 is an equidigital number, since it uses as much as digits as its factorization.

42511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6080.

The product of its digits is 40, while the sum is 13.

The square root of 42511 is about 206.1819584736. The cubic root of 42511 is about 34.9006707534.

Adding to 42511 its sum of digits (13), we get a palindrome (42524).

The spelling of 42511 in words is "forty-two thousand, five hundred eleven".