42431131 has 4 divisors (see below), whose sum is σ = 42455952. Its totient is φ = 42406312.

The previous prime is 42431117. The next prime is 42431141. The reversal of 42431131 is 13113424.

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 42431131 - 2⁷ = 42431003 is a prime.

It is a super-2 number, since 2×42431131² = 3600801755878322, 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 = 42431099 and 42431108.

It is not an unprimeable number, because it can be changed into a prime (42431101) 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, 9640 + ... + 13333.

It is an arithmetic number, because the mean of its divisors is an integer number (10613988).

Almost surely, 2^42431131 is an apocalyptic number.

42431131 is a deficient number, since it is larger than the sum of its proper divisors (24821).

42431131 is a wasteful number, since it uses less digits than its factorization.

42431131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24820.

The product of its digits is 288, while the sum is 19.

The square root of 42431131 is about 6513.9182524806. The cubic root of 42431131 is about 348.7880010663.

Adding to 42431131 its reverse (13113424), we get a palindrome (55544555).

The spelling of 42431131 in words is "forty-two million, four hundred thirty-one thousand, one hundred thirty-one".