42581131 has 4 divisors (see below), whose sum is σ = 42594552. Its totient is φ = 42567712.

The previous prime is 42581129. The next prime is 42581153. The reversal of 42581131 is 13118524.

42581131 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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 42581131 - 2¹ = 42581129 is a prime.

It is a super-2 number, since 2×42581131² = 3626305434478322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 42581096 and 42581105.

It is not an unprimeable number, because it can be changed into a prime (42581171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1011 + ... + 9283.

It is an arithmetic number, because the mean of its divisors is an integer number (10648638).

Almost surely, 2^42581131 is an apocalyptic number.

42581131 is a deficient number, since it is larger than the sum of its proper divisors (13421).

42581131 is an equidigital number, since it uses as much as digits as its factorization.

42581131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13420.

The product of its digits is 960, while the sum is 25.

The square root of 42581131 is about 6525.4219020689. The cubic root of 42581131 is about 349.1985225317.

Adding to 42581131 its reverse (13118524), we get a palindrome (55699655).

The spelling of 42581131 in words is "forty-two million, five hundred eighty-one thousand, one hundred thirty-one".