42081139 has 2 divisors, whose sum is σ = 42081140. Its totient is φ = 42081138.

The previous prime is 42081113. The next prime is 42081163. The reversal of 42081139 is 93118024.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42081139 - 2¹⁵ = 42048371 is a prime.

It is not a weakly prime, because it can be changed into another prime (42081199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21040569 + 21040570.

It is an arithmetic number, because the mean of its divisors is an integer number (21040570).

Almost surely, 2^42081139 is an apocalyptic number.

42081139 is a deficient number, since it is larger than the sum of its proper divisors (1).

42081139 is an equidigital number, since it uses as much as digits as its factorization.

42081139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 42081139 is about 6486.9976876826. The cubic root of 42081139 is about 347.8263628198.

The spelling of 42081139 in words is "forty-two million, eighty-one thousand, one hundred thirty-nine".