305515139 has 2 divisors, whose sum is σ = 305515140. Its totient is φ = 305515138.

The previous prime is 305515127. The next prime is 305515151. The reversal of 305515139 is 931515503.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (305515127) and next prime (305515151).

It is a cyclic number.

It is not a de Polignac number, because 305515139 - 2⁴ = 305515123 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (305515169) 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, 152757569 + 152757570.

It is an arithmetic number, because the mean of its divisors is an integer number (152757570).

Almost surely, 2^305515139 is an apocalyptic number.

305515139 is a deficient number, since it is larger than the sum of its proper divisors (1).

305515139 is an equidigital number, since it uses as much as digits as its factorization.

305515139 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10125, while the sum is 32.

The square root of 305515139 is about 17478.9913610597. The cubic root of 305515139 is about 673.5103052182.

The spelling of 305515139 in words is "three hundred five million, five hundred fifteen thousand, one hundred thirty-nine".