42111631 has 4 divisors (see below), whose sum is σ = 42155712. Its totient is φ = 42067552.

The previous prime is 42111623. The next prime is 42111659. The reversal of 42111631 is 13611124.

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 42111631 - 2³ = 42111623 is a prime.

It is a super-3 number, since 3×42111631³ (a number of 24 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 42111599 and 42111608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42111611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20575 + ... + 22528.

It is an arithmetic number, because the mean of its divisors is an integer number (10538928).

Almost surely, 2^42111631 is an apocalyptic number.

42111631 is a deficient number, since it is larger than the sum of its proper divisors (44081).

42111631 is an equidigital number, since it uses as much as digits as its factorization.

42111631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44080.

The product of its digits is 144, while the sum is 19.

The square root of 42111631 is about 6489.3475018680. The cubic root of 42111631 is about 347.9103542155.

Adding to 42111631 its reverse (13611124), we get a palindrome (55722755).

The spelling of 42111631 in words is "forty-two million, one hundred eleven thousand, six hundred thirty-one".