309136189 has 2 divisors, whose sum is σ = 309136190. Its totient is φ = 309136188.

The previous prime is 309136171. The next prime is 309136229. The reversal of 309136189 is 981631903.

It is an a-pointer prime, because the next prime (309136229) can be obtained adding 309136189 to its sum of digits (40).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 305096089 + 4040100 = 17467^2 + 2010^2 .

It is a cyclic number.

It is not a de Polignac number, because 309136189 - 2⁹ = 309135677 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (309136129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 154568094 + 154568095.

It is an arithmetic number, because the mean of its divisors is an integer number (154568095).

Almost surely, 2^309136189 is an apocalyptic number.

It is an amenable number.

309136189 is a deficient number, since it is larger than the sum of its proper divisors (1).

309136189 is an equidigital number, since it uses as much as digits as its factorization.

309136189 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34992, while the sum is 40.

The square root of 309136189 is about 17582.2691652699. The cubic root of 309136189 is about 676.1607382728.

The spelling of 309136189 in words is "three hundred nine million, one hundred thirty-six thousand, one hundred eighty-nine".