181105139 has 2 divisors, whose sum is σ = 181105140. Its totient is φ = 181105138.

The previous prime is 181105109. The next prime is 181105201. The reversal of 181105139 is 931501181.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 181105139 - 2¹⁶ = 181039603 is a prime.

It is not a weakly prime, because it can be changed into another prime (181105109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90552569 + 90552570.

It is an arithmetic number, because the mean of its divisors is an integer number (90552570).

Almost surely, 2^181105139 is an apocalyptic number.

181105139 is a deficient number, since it is larger than the sum of its proper divisors (1).

181105139 is an equidigital number, since it uses as much as digits as its factorization.

181105139 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1080, while the sum is 29.

The square root of 181105139 is about 13457.5309399607. The cubic root of 181105139 is about 565.7747889732.

The spelling of 181105139 in words is "one hundred eighty-one million, one hundred five thousand, one hundred thirty-nine".