1316648813 has 2 divisors, whose sum is σ = 1316648814. Its totient is φ = 1316648812.

The previous prime is 1316648783. The next prime is 1316648857. The reversal of 1316648813 is 3188466131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 872198089 + 444450724 = 29533^2 + 21082^2 .

It is a cyclic number.

It is not a de Polignac number, because 1316648813 - 2¹⁰ = 1316647789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1316678813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 658324406 + 658324407.

It is an arithmetic number, because the mean of its divisors is an integer number (658324407).

Almost surely, 2^1316648813 is an apocalyptic number.

It is an amenable number.

1316648813 is a deficient number, since it is larger than the sum of its proper divisors (1).

1316648813 is an equidigital number, since it uses as much as digits as its factorization.

1316648813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 82944, while the sum is 41.

The square root of 1316648813 is about 36285.6557471406. The cubic root of 1316648813 is about 1096.0322100240.

The spelling of 1316648813 in words is "one billion, three hundred sixteen million, six hundred forty-eight thousand, eight hundred thirteen".