393391121 has 2 divisors, whose sum is σ = 393391122. Its totient is φ = 393391120.

The previous prime is 393391109. The next prime is 393391157. The reversal of 393391121 is 121193393.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 382632721 + 10758400 = 19561^2 + 3280^2 .

It is a cyclic number.

It is not a de Polignac number, because 393391121 - 2¹⁰ = 393390097 is a prime.

It is not a weakly prime, because it can be changed into another prime (399391121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 196695560 + 196695561.

It is an arithmetic number, because the mean of its divisors is an integer number (196695561).

Almost surely, 2^393391121 is an apocalyptic number.

It is an amenable number.

393391121 is a deficient number, since it is larger than the sum of its proper divisors (1).

393391121 is an equidigital number, since it uses as much as digits as its factorization.

393391121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4374, while the sum is 32.

The square root of 393391121 is about 19834.0898707251. The cubic root of 393391121 is about 732.7258575036.

The spelling of 393391121 in words is "three hundred ninety-three million, three hundred ninety-one thousand, one hundred twenty-one".