305138047 has 2 divisors, whose sum is σ = 305138048. Its totient is φ = 305138046.

The previous prime is 305138039. The next prime is 305138051. The reversal of 305138047 is 740831503.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 305138047 - 2³ = 305138039 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (305138017) 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, 152569023 + 152569024.

It is an arithmetic number, because the mean of its divisors is an integer number (152569024).

Almost surely, 2^305138047 is an apocalyptic number.

305138047 is a deficient number, since it is larger than the sum of its proper divisors (1).

305138047 is an equidigital number, since it uses as much as digits as its factorization.

305138047 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 305138047 is about 17468.2010235742. The cubic root of 305138047 is about 673.2330904643.

The spelling of 305138047 in words is "three hundred five million, one hundred thirty-eight thousand, forty-seven".