181252129 has 2 divisors, whose sum is σ = 181252130. Its totient is φ = 181252128.

The previous prime is 181252091. The next prime is 181252151. The reversal of 181252129 is 921252181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 177822225 + 3429904 = 13335^2 + 1852^2 .

It is a cyclic number.

It is not a de Polignac number, because 181252129 - 2⁹ = 181251617 is a prime.

It is a Chen prime.

It is an alternating number because its digits alternate between odd and even.

It is a self number, because there is not a number n which added to its sum of digits gives 181252129.

It is not a weakly prime, because it can be changed into another prime (181252199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90626064 + 90626065.

It is an arithmetic number, because the mean of its divisors is an integer number (90626065).

Almost surely, 2^181252129 is an apocalyptic number.

It is an amenable number.

181252129 is a deficient number, since it is larger than the sum of its proper divisors (1).

181252129 is an equidigital number, since it uses as much as digits as its factorization.

181252129 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2880, while the sum is 31.

The square root of 181252129 is about 13462.9910866791. The cubic root of 181252129 is about 565.9278137992.

The spelling of 181252129 in words is "one hundred eighty-one million, two hundred fifty-two thousand, one hundred twenty-nine".