1316990993 has 2 divisors, whose sum is σ = 1316990994. Its totient is φ = 1316990992.

The previous prime is 1316990981. The next prime is 1316991041. The reversal of 1316990993 is 3990996131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 673506304 + 643484689 = 25952^2 + 25367^2 .

It is a cyclic number.

It is not a de Polignac number, because 1316990993 - 2⁶ = 1316990929 is a prime.

It is not a weakly prime, because it can be changed into another prime (1316990923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 658495496 + 658495497.

It is an arithmetic number, because the mean of its divisors is an integer number (658495497).

Almost surely, 2^1316990993 is an apocalyptic number.

It is an amenable number.

1316990993 is a deficient number, since it is larger than the sum of its proper divisors (1).

1316990993 is an equidigital number, since it uses as much as digits as its factorization.

1316990993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 354294, while the sum is 50.

The square root of 1316990993 is about 36290.3705271798. The cubic root of 1316990993 is about 1096.1271499992.

The spelling of 1316990993 in words is "one billion, three hundred sixteen million, nine hundred ninety thousand, nine hundred ninety-three".