181429139 has 2 divisors, whose sum is σ = 181429140. Its totient is φ = 181429138.

The previous prime is 181429121. The next prime is 181429153. The reversal of 181429139 is 931924181.

It is a strong prime.

It is an emirp because it is prime and its reverse (931924181) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-181429139 is a prime.

It is not a weakly prime, because it can be changed into another prime (181429159) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90714569 + 90714570.

It is an arithmetic number, because the mean of its divisors is an integer number (90714570).

Almost surely, 2^181429139 is an apocalyptic number.

181429139 is a deficient number, since it is larger than the sum of its proper divisors (1).

181429139 is an equidigital number, since it uses as much as digits as its factorization.

181429139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15552, while the sum is 38.

The square root of 181429139 is about 13469.5634301933. The cubic root of 181429139 is about 566.1119813645. Note that the first 3 decimals are identical.

The spelling of 181429139 in words is "one hundred eighty-one million, four hundred twenty-nine thousand, one hundred thirty-nine".