42031139 has 2 divisors, whose sum is σ = 42031140. Its totient is φ = 42031138.

The previous prime is 42031127. The next prime is 42031153. The reversal of 42031139 is 93113024.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42031139 - 2¹⁶ = 41965603 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (42031159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21015569 + 21015570.

It is an arithmetic number, because the mean of its divisors is an integer number (21015570).

Almost surely, 2^42031139 is an apocalyptic number.

42031139 is a deficient number, since it is larger than the sum of its proper divisors (1).

42031139 is an equidigital number, since it uses as much as digits as its factorization.

42031139 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 42031139 is about 6483.1426792876. The cubic root of 42031139 is about 347.6885480242.

The spelling of 42031139 in words is "forty-two million, thirty-one thousand, one hundred thirty-nine".