385322681 has 4 divisors (see below), whose sum is σ = 398609700. Its totient is φ = 372035664.

The previous prime is 385322621. The next prime is 385322683. The reversal of 385322681 is 186223583.

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 76125625 + 309197056 = 8725^2 + 17584^2 .

It is not a de Polignac number, because 385322681 - 2⁶ = 385322617 is a prime.

It is a super-2 number, since 2×385322681² = 296947136986055522, which contains 22 as substring.

It is a pancake number, because a pancake can be divided into 385322681 parts by 27760 straight cuts.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (385322683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6643466 + ... + 6643523.

It is an arithmetic number, because the mean of its divisors is an integer number (99652425).

Almost surely, 2^385322681 is an apocalyptic number.

It is an amenable number.

385322681 is a deficient number, since it is larger than the sum of its proper divisors (13287019).

385322681 is a wasteful number, since it uses less digits than its factorization.

385322681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13287018.

The product of its digits is 69120, while the sum is 38.

The square root of 385322681 is about 19629.6378214169. The cubic root of 385322681 is about 727.6818192790.

The spelling of 385322681 in words is "three hundred eighty-five million, three hundred twenty-two thousand, six hundred eighty-one".