3817981613 has 2 divisors, whose sum is σ = 3817981614. Its totient is φ = 3817981612.

The previous prime is 3817981589. The next prime is 3817981621. The reversal of 3817981613 is 3161897183.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2218221604 + 1599760009 = 47098^2 + 39997^2 .

It is a cyclic number.

It is not a de Polignac number, because 3817981613 - 2¹⁰ = 3817980589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3817980613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1908990806 + 1908990807.

It is an arithmetic number, because the mean of its divisors is an integer number (1908990807).

Almost surely, 2^3817981613 is an apocalyptic number.

It is an amenable number.

3817981613 is a deficient number, since it is larger than the sum of its proper divisors (1).

3817981613 is an equidigital number, since it uses as much as digits as its factorization.

3817981613 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 217728, while the sum is 47.

The square root of 3817981613 is about 61789.8180366312. The cubic root of 3817981613 is about 1562.9482942633.

The spelling of 3817981613 in words is "three billion, eight hundred seventeen million, nine hundred eighty-one thousand, six hundred thirteen".