3855085813 has 2 divisors, whose sum is σ = 3855085814. Its totient is φ = 3855085812.

The previous prime is 3855085789. The next prime is 3855085831. The reversal of 3855085813 is 3185805583.

Together with next prime (3855085831) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2459465649 + 1395620164 = 49593^2 + 37358^2 .

It is an emirp because it is prime and its reverse (3185805583) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3855085813 - 2¹³ = 3855077621 is a prime.

It is a super-3 number, since 3×3855085813³ (a number of 30 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3855085873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1927542906 + 1927542907.

It is an arithmetic number, because the mean of its divisors is an integer number (1927542907).

Almost surely, 2^3855085813 is an apocalyptic number.

It is an amenable number.

3855085813 is a deficient number, since it is larger than the sum of its proper divisors (1).

3855085813 is an equidigital number, since it uses as much as digits as its factorization.

3855085813 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576000, while the sum is 46.

The square root of 3855085813 is about 62089.3373535263. The cubic root of 3855085813 is about 1567.9950352832.

The spelling of 3855085813 in words is "three billion, eight hundred fifty-five million, eighty-five thousand, eight hundred thirteen".