8021583381 has 32 divisors (see below), whose sum is σ = 12878300160. Its totient is φ = 4338596736.

The previous prime is 8021583377. The next prime is 8021583403. The reversal of 8021583381 is 1833851208.

It is not a de Polignac number, because 8021583381 - 2² = 8021583377 is a prime.

It is a super-2 number, since 2×8021583381² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8021583341) 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 31 ways as a sum of consecutive naturals, for example, 465145 + ... + 482081.

It is an arithmetic number, because the mean of its divisors is an integer number (402446880).

Almost surely, 2^8021583381 is an apocalyptic number.

It is an amenable number.

8021583381 is a deficient number, since it is larger than the sum of its proper divisors (4856716779).

8021583381 is a wasteful number, since it uses less digits than its factorization.

8021583381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18153.

The product of its (nonzero) digits is 46080, while the sum is 39.

The square root of 8021583381 is about 89563.2925980281. The cubic root of 8021583381 is about 2001.7969999953.

The spelling of 8021583381 in words is "eight billion, twenty-one million, five hundred eighty-three thousand, three hundred eighty-one".