82280381 has 2 divisors, whose sum is σ = 82280382. Its totient is φ = 82280380.

The previous prime is 82280369. The next prime is 82280389. The reversal of 82280381 is 18308228.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 66748900 + 15531481 = 8170^2 + 3941^2 .

It is a cyclic number.

It is not a de Polignac number, because 82280381 - 2¹⁰ = 82279357 is a prime.

It is a super-2 number, since 2×82280381² = 13540122195010322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (82280389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41140190 + 41140191.

It is an arithmetic number, because the mean of its divisors is an integer number (41140191).

Almost surely, 2^82280381 is an apocalyptic number.

It is an amenable number.

82280381 is a deficient number, since it is larger than the sum of its proper divisors (1).

82280381 is an equidigital number, since it uses as much as digits as its factorization.

82280381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6144, while the sum is 32.

The square root of 82280381 is about 9070.8533777148. The cubic root of 82280381 is about 434.9427519677.

The spelling of 82280381 in words is "eighty-two million, two hundred eighty thousand, three hundred eighty-one".