309995141 has 2 divisors, whose sum is σ = 309995142. Its totient is φ = 309995140.

The previous prime is 309995129. The next prime is 309995143. The reversal of 309995141 is 141599903.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 291419041 + 18576100 = 17071^2 + 4310^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-309995141 is a prime.

Together with 309995143, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p_16764269 and since 309995141 and 16764269 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (309995143) 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, 154997570 + 154997571.

It is an arithmetic number, because the mean of its divisors is an integer number (154997571).

Almost surely, 2^309995141 is an apocalyptic number.

It is an amenable number.

309995141 is a deficient number, since it is larger than the sum of its proper divisors (1).

309995141 is an equidigital number, since it uses as much as digits as its factorization.

309995141 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 43740, while the sum is 41.

The square root of 309995141 is about 17606.6788747907. The cubic root of 309995141 is about 676.7864091467.

The spelling of 309995141 in words is "three hundred nine million, nine hundred ninety-five thousand, one hundred forty-one".