42281231 has 2 divisors, whose sum is σ = 42281232. Its totient is φ = 42281230.

The previous prime is 42281207. The next prime is 42281237. The reversal of 42281231 is 13218224.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42281231 is a prime.

It is a super-2 number, since 2×42281231² = 3575404989750722, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 42281197 and 42281206.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42281237) 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 as a sum of consecutive naturals, namely, 21140615 + 21140616.

It is an arithmetic number, because the mean of its divisors is an integer number (21140616).

Almost surely, 2^42281231 is an apocalyptic number.

42281231 is a deficient number, since it is larger than the sum of its proper divisors (1).

42281231 is an equidigital number, since it uses as much as digits as its factorization.

42281231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 768, while the sum is 23.

The square root of 42281231 is about 6502.4019408216. The cubic root of 42281231 is about 348.3767856073.

Adding to 42281231 its reverse (13218224), we get a palindrome (55499455).

The spelling of 42281231 in words is "forty-two million, two hundred eighty-one thousand, two hundred thirty-one".