42123131 has 8 divisors (see below), whose sum is σ = 43488720. Its totient is φ = 40769568.

The previous prime is 42123121. The next prime is 42123149. The reversal of 42123131 is 13132124.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 42123131 - 2²² = 37928827 is a prime.

It is a super-2 number, since 2×42123131² = 3548716330486322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42123121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4400 + ... + 10178.

It is an arithmetic number, because the mean of its divisors is an integer number (5436090).

Almost surely, 2^42123131 is an apocalyptic number.

42123131 is a deficient number, since it is larger than the sum of its proper divisors (1365589).

42123131 is a wasteful number, since it uses less digits than its factorization.

42123131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6013.

The product of its digits is 144, while the sum is 17.

The square root of 42123131 is about 6490.2335088963. The cubic root of 42123131 is about 347.9420208821.

Adding to 42123131 its reverse (13132124), we get a palindrome (55255255).

The spelling of 42123131 in words is "forty-two million, one hundred twenty-three thousand, one hundred thirty-one".