42112131 has 4 divisors (see below), whose sum is σ = 56149512. Its totient is φ = 28074752.

The previous prime is 42112129. The next prime is 42112139. The reversal of 42112131 is 13121124.

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 42112131 - 2¹ = 42112129 is a prime.

It is a super-2 number, since 2×42112131² = 3546863154722322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 42112131.

It is not an unprimeable number, because it can be changed into a prime (42112139) 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, 7018686 + ... + 7018691.

It is an arithmetic number, because the mean of its divisors is an integer number (14037378).

Almost surely, 2^42112131 is an apocalyptic number.

42112131 is a deficient number, since it is larger than the sum of its proper divisors (14037381).

42112131 is a wasteful number, since it uses less digits than its factorization.

42112131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14037380.

The product of its digits is 48, while the sum is 15.

The square root of 42112131 is about 6489.3860264281. The cubic root of 42112131 is about 347.9117311470.

Adding to 42112131 its reverse (13121124), we get a palindrome (55233255).

The spelling of 42112131 in words is "forty-two million, one hundred twelve thousand, one hundred thirty-one".