8281381 has 2 divisors, whose sum is σ = 8281382. Its totient is φ = 8281380.

The previous prime is 8281379. The next prime is 8281387. The reversal of 8281381 is 1831828.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6225025 + 2056356 = 2495^2 + 1434^2 .

It is a cyclic number.

It is not a de Polignac number, because 8281381 - 2¹ = 8281379 is a prime.

It is a super-2 number, since 2×8281381² = 137162542534322, which contains 22 as substring.

Together with 8281379, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8281387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4140690 + 4140691.

It is an arithmetic number, because the mean of its divisors is an integer number (4140691).

Almost surely, 2^8281381 is an apocalyptic number.

It is an amenable number.

8281381 is a deficient number, since it is larger than the sum of its proper divisors (1).

8281381 is an equidigital number, since it uses as much as digits as its factorization.

8281381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3072, while the sum is 31.

The square root of 8281381 is about 2877.7388693208. The cubic root of 8281381 is about 202.3178751662.

It can be divided in two parts, 828 and 1381, that added together give a square (2209 = 47²).

The spelling of 8281381 in words is "eight million, two hundred eighty-one thousand, three hundred eighty-one".