181132139 has 2 divisors, whose sum is σ = 181132140. Its totient is φ = 181132138.

The previous prime is 181132123. The next prime is 181132213. The reversal of 181132139 is 931231181.

It is a weak prime.

It is an emirp because it is prime and its reverse (931231181) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 181132139 - 2⁴ = 181132123 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (181132109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90566069 + 90566070.

It is an arithmetic number, because the mean of its divisors is an integer number (90566070).

Almost surely, 2^181132139 is an apocalyptic number.

181132139 is a deficient number, since it is larger than the sum of its proper divisors (1).

181132139 is an equidigital number, since it uses as much as digits as its factorization.

181132139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1296, while the sum is 29.

The square root of 181132139 is about 13458.5340583587. The cubic root of 181132139 is about 565.8029036921.

The spelling of 181132139 in words is "one hundred eighty-one million, one hundred thirty-two thousand, one hundred thirty-nine".