42331231 has 2 divisors, whose sum is σ = 42331232. Its totient is φ = 42331230.

The previous prime is 42331217. The next prime is 42331277. The reversal of 42331231 is 13213324.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42331231 - 2⁷ = 42331103 is a prime.

It is a super-2 number, since 2×42331231² = 3583866235950722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 42331199 and 42331208.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42331291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21165615 + 21165616.

It is an arithmetic number, because the mean of its divisors is an integer number (21165616).

Almost surely, 2^42331231 is an apocalyptic number.

42331231 is a deficient number, since it is larger than the sum of its proper divisors (1).

42331231 is an equidigital number, since it uses as much as digits as its factorization.

42331231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 432, while the sum is 19.

The square root of 42331231 is about 6506.2455379428. The cubic root of 42331231 is about 348.5140567409.

Adding to 42331231 its reverse (13213324), we get a palindrome (55544555).

The spelling of 42331231 in words is "forty-two million, three hundred thirty-one thousand, two hundred thirty-one".