42243281 has 2 divisors, whose sum is σ = 42243282. Its totient is φ = 42243280.

The previous prime is 42243269. The next prime is 42243337. The reversal of 42243281 is 18234224.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22137025 + 20106256 = 4705^2 + 4484^2 .

It is a cyclic number.

It is not a de Polignac number, because 42243281 - 2¹⁴ = 42226897 is a prime.

It is a super-2 number, since 2×42243281² = 3568989579289922, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 42243281.

It is not a weakly prime, because it can be changed into another prime (42243211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21121640 + 21121641.

It is an arithmetic number, because the mean of its divisors is an integer number (21121641).

Almost surely, 2^42243281 is an apocalyptic number.

It is an amenable number.

42243281 is a deficient number, since it is larger than the sum of its proper divisors (1).

42243281 is an equidigital number, since it uses as much as digits as its factorization.

42243281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3072, while the sum is 26.

The square root of 42243281 is about 6499.4831332961. The cubic root of 42243281 is about 348.2725245581.

It can be divided in two parts, 42243 and 281, that added together give a palindrome (42524).

The spelling of 42243281 in words is "forty-two million, two hundred forty-three thousand, two hundred eighty-one".