385557528281 has 4 divisors (see below), whose sum is σ = 385620606132. Its totient is φ = 385494450432.

The previous prime is 385557528271. The next prime is 385557528289. The reversal of 385557528281 is 182825755583.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 317626925056 + 67930603225 = 563584^2 + 260635^2 .

It is a cyclic number.

It is not a de Polignac number, because 385557528281 - 2¹⁸ = 385557266137 is a prime.

It is a super-2 number, since 2×385557528281² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 385557528281.

It is not an unprimeable number, because it can be changed into a prime (385557528289) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31529756 + ... + 31541981.

It is an arithmetic number, because the mean of its divisors is an integer number (96405151533).

Almost surely, 2^385557528281 is an apocalyptic number.

It is an amenable number.

385557528281 is a deficient number, since it is larger than the sum of its proper divisors (63077851).

385557528281 is an equidigital number, since it uses as much as digits as its factorization.

385557528281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63077850.

The product of its digits is 26880000, while the sum is 59.

The spelling of 385557528281 in words is "three hundred eighty-five billion, five hundred fifty-seven million, five hundred twenty-eight thousand, two hundred eighty-one".