393391109 has 2 divisors, whose sum is σ = 393391110. Its totient is φ = 393391108.

The previous prime is 393391091. The next prime is 393391121. The reversal of 393391109 is 901193393.

Together with previous prime (393391091) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 370447009 + 22944100 = 19247^2 + 4790^2 .

It is a cyclic number.

It is not a de Polignac number, because 393391109 - 2²⁴ = 376613893 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (393391189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 196695554 + 196695555.

It is an arithmetic number, because the mean of its divisors is an integer number (196695555).

Almost surely, 2^393391109 is an apocalyptic number.

It is an amenable number.

393391109 is a deficient number, since it is larger than the sum of its proper divisors (1).

393391109 is an equidigital number, since it uses as much as digits as its factorization.

393391109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19683, while the sum is 38.

The square root of 393391109 is about 19834.0895682156. The cubic root of 393391109 is about 732.7258500532.

The spelling of 393391109 in words is "three hundred ninety-three million, three hundred ninety-one thousand, one hundred nine".