42135131 has 4 divisors (see below), whose sum is σ = 42187152. Its totient is φ = 42083112.

The previous prime is 42135127. The next prime is 42135133. The reversal of 42135131 is 13153124.

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 42135131 - 2² = 42135127 is a prime.

It is a super-2 number, since 2×42135131² = 3550738528774322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42135133) 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, 24776 + ... + 26421.

It is an arithmetic number, because the mean of its divisors is an integer number (10546788).

Almost surely, 2^42135131 is an apocalyptic number.

42135131 is a deficient number, since it is larger than the sum of its proper divisors (52021).

42135131 is an equidigital number, since it uses as much as digits as its factorization.

42135131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52020.

The product of its digits is 360, while the sum is 20.

The square root of 42135131 is about 6491.1579090329. The cubic root of 42135131 is about 347.9750582159.

Adding to 42135131 its reverse (13153124), we get a palindrome (55288255).

The spelling of 42135131 in words is "forty-two million, one hundred thirty-five thousand, one hundred thirty-one".