389311309 has 2 divisors, whose sum is σ = 389311310. Its totient is φ = 389311308.

The previous prime is 389311303. The next prime is 389311313. The reversal of 389311309 is 903113983.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 388957284 + 354025 = 19722^2 + 595^2 .

It is an emirp because it is prime and its reverse (903113983) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 389311309 - 2⁹ = 389310797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (389311303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 194655654 + 194655655.

It is an arithmetic number, because the mean of its divisors is an integer number (194655655).

Almost surely, 2^389311309 is an apocalyptic number.

It is an amenable number.

389311309 is a deficient number, since it is larger than the sum of its proper divisors (1).

389311309 is an equidigital number, since it uses as much as digits as its factorization.

389311309 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 37.

The square root of 389311309 is about 19730.9733414244. The cubic root of 389311309 is about 730.1840462950.

The spelling of 389311309 in words is "three hundred eighty-nine million, three hundred eleven thousand, three hundred nine".