82271281 has 2 divisors, whose sum is σ = 82271282. Its totient is φ = 82271280.

The previous prime is 82271269. The next prime is 82271339. The reversal of 82271281 is 18217228.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 70711281 + 11560000 = 8409^2 + 3400^2 .

It is a cyclic number.

It is not a de Polignac number, because 82271281 - 2¹³ = 82263089 is a prime.

It is a super-2 number, since 2×82271281² = 13537127354761922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (82271201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41135640 + 41135641.

It is an arithmetic number, because the mean of its divisors is an integer number (41135641).

Almost surely, 2^82271281 is an apocalyptic number.

It is an amenable number.

82271281 is a deficient number, since it is larger than the sum of its proper divisors (1).

82271281 is an equidigital number, since it uses as much as digits as its factorization.

82271281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3584, while the sum is 31.

The square root of 82271281 is about 9070.3517572363. The cubic root of 82271281 is about 434.9267168574.

The spelling of 82271281 in words is "eighty-two million, two hundred seventy-one thousand, two hundred eighty-one".