42131231 has 4 divisors (see below), whose sum is σ = 43158864. Its totient is φ = 41103600.

The previous prime is 42131183. The next prime is 42131267. The reversal of 42131231 is 13213124.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42131231 is a prime.

It is a super-2 number, since 2×42131231² = 3550081251150722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42131281) 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, 513755 + ... + 513836.

It is an arithmetic number, because the mean of its divisors is an integer number (10789716).

Almost surely, 2^42131231 is an apocalyptic number.

42131231 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

42131231 is a deficient number, since it is larger than the sum of its proper divisors (1027633).

42131231 is a wasteful number, since it uses less digits than its factorization.

42131231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1027632.

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

The square root of 42131231 is about 6490.8574934287. The cubic root of 42131231 is about 347.9643217705.

Adding to 42131231 its reverse (13213124), we get a palindrome (55344355).

It can be divided in two parts, 4213123 and 1, that added together give a palindrome (4213124).

The spelling of 42131231 in words is "forty-two million, one hundred thirty-one thousand, two hundred thirty-one".