1020331393 has 2 divisors, whose sum is σ = 1020331394. Its totient is φ = 1020331392.

The previous prime is 1020331379. The next prime is 1020331421. The reversal of 1020331393 is 3931330201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 916454529 + 103876864 = 30273^2 + 10192^2 .

It is an emirp because it is prime and its reverse (3931330201) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1020331393 - 2⁹ = 1020330881 is a prime.

It is not a weakly prime, because it can be changed into another prime (1020331693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510165696 + 510165697.

It is an arithmetic number, because the mean of its divisors is an integer number (510165697).

Almost surely, 2^1020331393 is an apocalyptic number.

It is an amenable number.

1020331393 is a deficient number, since it is larger than the sum of its proper divisors (1).

1020331393 is an equidigital number, since it uses as much as digits as its factorization.

1020331393 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1458, while the sum is 25.

The square root of 1020331393 is about 31942.6265826716. The cubic root of 1020331393 is about 1006.7317133507.

Adding to 1020331393 its reverse (3931330201), we get a palindrome (4951661594).

The spelling of 1020331393 in words is "one billion, twenty million, three hundred thirty-one thousand, three hundred ninety-three".