1373816813 has 2 divisors, whose sum is σ = 1373816814. Its totient is φ = 1373816812.

The previous prime is 1373816737. The next prime is 1373816827. The reversal of 1373816813 is 3186183731.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 701296324 + 672520489 = 26482^2 + 25933^2 .

It is a cyclic number.

It is not a de Polignac number, because 1373816813 - 2¹² = 1373812717 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1373816833) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 686908406 + 686908407.

It is an arithmetic number, because the mean of its divisors is an integer number (686908407).

Almost surely, 2^1373816813 is an apocalyptic number.

It is an amenable number.

1373816813 is a deficient number, since it is larger than the sum of its proper divisors (1).

1373816813 is an equidigital number, since it uses as much as digits as its factorization.

1373816813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72576, while the sum is 41.

The square root of 1373816813 is about 37065.0349116253. The cubic root of 1373816813 is about 1111.6709980773.

The spelling of 1373816813 in words is "one billion, three hundred seventy-three million, eight hundred sixteen thousand, eight hundred thirteen".