42678281 has 2 divisors, whose sum is σ = 42678282. Its totient is φ = 42678280.

The previous prime is 42678269. The next prime is 42678301. The reversal of 42678281 is 18287624.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 33582025 + 9096256 = 5795^2 + 3016^2 .

It is a cyclic number.

It is not a de Polignac number, because 42678281 - 2⁶ = 42678217 is a prime.

It is a super-2 number, since 2×42678281² = 3642871338229922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (42678241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21339140 + 21339141.

It is an arithmetic number, because the mean of its divisors is an integer number (21339141).

Almost surely, 2^42678281 is an apocalyptic number.

It is an amenable number.

42678281 is a deficient number, since it is larger than the sum of its proper divisors (1).

42678281 is an equidigital number, since it uses as much as digits as its factorization.

42678281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 43008, while the sum is 38.

The square root of 42678281 is about 6532.8616241277. The cubic root of 42678281 is about 349.4638894390.

The spelling of 42678281 in words is "forty-two million, six hundred seventy-eight thousand, two hundred eighty-one".