384081581 has 4 divisors (see below), whose sum is σ = 413626332. Its totient is φ = 354536832.

The previous prime is 384081569. The next prime is 384081583. The reversal of 384081581 is 185180483.

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 92833225 + 291248356 = 9635^2 + 17066^2 .

It is not a de Polignac number, because 384081581 - 2¹⁴ = 384065197 is a prime.

It is a super-2 number, since 2×384081581² = 295037321726919122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (384081583) 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 in 3 ways as a sum of consecutive naturals, for example, 14772356 + ... + 14772381.

It is an arithmetic number, because the mean of its divisors is an integer number (103406583).

Almost surely, 2^384081581 is an apocalyptic number.

It is an amenable number.

384081581 is a deficient number, since it is larger than the sum of its proper divisors (29544751).

384081581 is a wasteful number, since it uses less digits than its factorization.

384081581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29544750.

The product of its (nonzero) digits is 30720, while the sum is 38.

The square root of 384081581 is about 19597.9994132054. Note that the first 3 decimals coincide. The cubic root of 384081581 is about 726.8997065836.

It can be divided in two parts, 38 and 4081581, that multiplied together give a triangular number (155100078 = T₁₇₆₁₂).

The spelling of 384081581 in words is "three hundred eighty-four million, eighty-one thousand, five hundred eighty-one".