309136229 has 2 divisors, whose sum is σ = 309136230. Its totient is φ = 309136228.

The previous prime is 309136189. The next prime is 309136271. The reversal of 309136229 is 922631903.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 239413729 + 69722500 = 15473^2 + 8350^2 .

It is an emirp because it is prime and its reverse (922631903) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 309136229 - 2²⁸ = 40700773 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 (309136129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 154568114 + 154568115.

It is an arithmetic number, because the mean of its divisors is an integer number (154568115).

Almost surely, 2^309136229 is an apocalyptic number.

It is an amenable number.

309136229 is a deficient number, since it is larger than the sum of its proper divisors (1).

309136229 is an equidigital number, since it uses as much as digits as its factorization.

309136229 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17496, while the sum is 35.

The square root of 309136229 is about 17582.2703027794. The cubic root of 309136229 is about 676.1607674362.

The spelling of 309136229 in words is "three hundred nine million, one hundred thirty-six thousand, two hundred twenty-nine".