181028389 has 2 divisors, whose sum is σ = 181028390. Its totient is φ = 181028388.

The previous prime is 181028369. The next prime is 181028401. The reversal of 181028389 is 983820181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 151413025 + 29615364 = 12305^2 + 5442^2 .

It is a cyclic number.

It is not a de Polignac number, because 181028389 - 2⁵ = 181028357 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (181028329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90514194 + 90514195.

It is an arithmetic number, because the mean of its divisors is an integer number (90514195).

Almost surely, 2^181028389 is an apocalyptic number.

It is an amenable number.

181028389 is a deficient number, since it is larger than the sum of its proper divisors (1).

181028389 is an equidigital number, since it uses as much as digits as its factorization.

181028389 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27648, while the sum is 40.

The square root of 181028389 is about 13454.6790745822. The cubic root of 181028389 is about 565.6948550173.

The spelling of 181028389 in words is "one hundred eighty-one million, twenty-eight thousand, three hundred eighty-nine".