385555813 has 2 divisors, whose sum is σ = 385555814. Its totient is φ = 385555812.

The previous prime is 385555811. The next prime is 385555861. The reversal of 385555813 is 318555583.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 385454689 + 101124 = 19633^2 + 318^2 .

It is a cyclic number.

It is not a de Polignac number, because 385555813 - 2¹ = 385555811 is a prime.

Together with 385555811, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 385555813.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (385555811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 192777906 + 192777907.

It is an arithmetic number, because the mean of its divisors is an integer number (192777907).

Almost surely, 2^385555813 is an apocalyptic number.

It is an amenable number.

385555813 is a deficient number, since it is larger than the sum of its proper divisors (1).

385555813 is an equidigital number, since it uses as much as digits as its factorization.

385555813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 360000, while the sum is 43.

The square root of 385555813 is about 19635.5751889269. The cubic root of 385555813 is about 727.8285462727.

The spelling of 385555813 in words is "three hundred eighty-five million, five hundred fifty-five thousand, eight hundred thirteen".