1371643813 has 2 divisors, whose sum is σ = 1371643814. Its totient is φ = 1371643812.

The previous prime is 1371643811. The next prime is 1371643829. The reversal of 1371643813 is 3183461731.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1369518049 + 2125764 = 37007^2 + 1458^2 .

It is a cyclic number.

It is not a de Polignac number, because 1371643813 - 2¹ = 1371643811 is a prime.

Together with 1371643811, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1371643811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 685821906 + 685821907.

It is an arithmetic number, because the mean of its divisors is an integer number (685821907).

Almost surely, 2^1371643813 is an apocalyptic number.

It is an amenable number.

1371643813 is a deficient number, since it is larger than the sum of its proper divisors (1).

1371643813 is an equidigital number, since it uses as much as digits as its factorization.

1371643813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36288, while the sum is 37.

The square root of 1371643813 is about 37035.7099702436. The cubic root of 1371643813 is about 1111.0845696167.

The spelling of 1371643813 in words is "one billion, three hundred seventy-one million, six hundred forty-three thousand, eight hundred thirteen".