8212381 has 2 divisors, whose sum is σ = 8212382. Its totient is φ = 8212380.

The previous prime is 8212367. The next prime is 8212397. The reversal of 8212381 is 1832128.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4347225 + 3865156 = 2085^2 + 1966^2 .

It is a cyclic number.

It is not a de Polignac number, because 8212381 - 2²¹ = 6115229 is a prime.

It is a super-2 number, since 2×8212381² = 134886403378322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8212681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4106190 + 4106191.

It is an arithmetic number, because the mean of its divisors is an integer number (4106191).

Almost surely, 2^8212381 is an apocalyptic number.

It is an amenable number.

8212381 is a deficient number, since it is larger than the sum of its proper divisors (1).

8212381 is an equidigital number, since it uses as much as digits as its factorization.

8212381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 768, while the sum is 25.

The square root of 8212381 is about 2865.7252136239. The cubic root of 8212381 is about 201.7544069483.

The spelling of 8212381 in words is "eight million, two hundred twelve thousand, three hundred eighty-one".