304221139 has 2 divisors, whose sum is σ = 304221140. Its totient is φ = 304221138.

The previous prime is 304221131. The next prime is 304221143. The reversal of 304221139 is 931122403.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 304221139 - 2³ = 304221131 is a prime.

It is not a weakly prime, because it can be changed into another prime (304221131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 152110569 + 152110570.

It is an arithmetic number, because the mean of its divisors is an integer number (152110570).

Almost surely, 2^304221139 is an apocalyptic number.

304221139 is a deficient number, since it is larger than the sum of its proper divisors (1).

304221139 is an equidigital number, since it uses as much as digits as its factorization.

304221139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 304221139 is about 17441.9362170603. The cubic root of 304221139 is about 672.5580821667.

The spelling of 304221139 in words is "three hundred four million, two hundred twenty-one thousand, one hundred thirty-nine".