42471139 has 2 divisors, whose sum is σ = 42471140. Its totient is φ = 42471138.

The previous prime is 42471131. The next prime is 42471157. The reversal of 42471139 is 93117424.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42471139 - 2³ = 42471131 is a prime.

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 42471139.

It is not a weakly prime, because it can be changed into another prime (42471131) 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, 21235569 + 21235570.

It is an arithmetic number, because the mean of its divisors is an integer number (21235570).

Almost surely, 2^42471139 is an apocalyptic number.

42471139 is a deficient number, since it is larger than the sum of its proper divisors (1).

42471139 is an equidigital number, since it uses as much as digits as its factorization.

42471139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6048, while the sum is 31.

The square root of 42471139 is about 6516.9884916271. The cubic root of 42471139 is about 348.8975898400.

The spelling of 42471139 in words is "forty-two million, four hundred seventy-one thousand, one hundred thirty-nine".