382721281 has 2 divisors, whose sum is σ = 382721282. Its totient is φ = 382721280.

The previous prime is 382721279. The next prime is 382721291. The reversal of 382721281 is 182127283.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 236698225 + 146023056 = 15385^2 + 12084^2 .

It is a cyclic number.

It is not a de Polignac number, because 382721281 - 2¹ = 382721279 is a prime.

It is a super-2 number, since 2×382721281² = 292951157860561922, which contains 22 as substring.

Together with 382721279, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (382721291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 191360640 + 191360641.

It is an arithmetic number, because the mean of its divisors is an integer number (191360641).

Almost surely, 2^382721281 is an apocalyptic number.

It is an amenable number.

382721281 is a deficient number, since it is larger than the sum of its proper divisors (1).

382721281 is an equidigital number, since it uses as much as digits as its factorization.

382721281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10752, while the sum is 34.

The square root of 382721281 is about 19563.2635569835. The cubic root of 382721281 is about 726.0405390118.

The spelling of 382721281 in words is "three hundred eighty-two million, seven hundred twenty-one thousand, two hundred eighty-one".