1391212393 has 2 divisors, whose sum is σ = 1391212394. Its totient is φ = 1391212392.

The previous prime is 1391212363. The next prime is 1391212399. The reversal of 1391212393 is 3932121931.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1304871129 + 86341264 = 36123^2 + 9292^2 .

It is an emirp because it is prime and its reverse (3932121931) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1391212393 - 2¹³ = 1391204201 is a prime.

It is not a weakly prime, because it can be changed into another prime (1391212399) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 695606196 + 695606197.

It is an arithmetic number, because the mean of its divisors is an integer number (695606197).

Almost surely, 2^1391212393 is an apocalyptic number.

It is an amenable number.

1391212393 is a deficient number, since it is larger than the sum of its proper divisors (1).

1391212393 is an equidigital number, since it uses as much as digits as its factorization.

1391212393 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8748, while the sum is 34.

The square root of 1391212393 is about 37298.9596771813. The cubic root of 1391212393 is about 1116.3434089284.

The spelling of 1391212393 in words is "one billion, three hundred ninety-one million, two hundred twelve thousand, three hundred ninety-three".