42771139 has 2 divisors, whose sum is σ = 42771140. Its totient is φ = 42771138.

The previous prime is 42771121. The next prime is 42771151. The reversal of 42771139 is 93117724.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42771139 - 2¹³ = 42762947 is a prime.

It is not a weakly prime, because it can be changed into another prime (42774139) 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, 21385569 + 21385570.

It is an arithmetic number, because the mean of its divisors is an integer number (21385570).

Almost surely, 2^42771139 is an apocalyptic number.

42771139 is a deficient number, since it is larger than the sum of its proper divisors (1).

42771139 is an equidigital number, since it uses as much as digits as its factorization.

42771139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10584, while the sum is 34.

The square root of 42771139 is about 6539.9647552567. The cubic root of 42771139 is about 349.7171565229.

The spelling of 42771139 in words is "forty-two million, seven hundred seventy-one thousand, one hundred thirty-nine".