82582781 has 2 divisors, whose sum is σ = 82582782. Its totient is φ = 82582780.

The previous prime is 82582769. The next prime is 82582849. The reversal of 82582781 is 18728528.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 67798756 + 14784025 = 8234^2 + 3845^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-82582781 is a prime.

It is a super-2 number, since 2×82582781² = 13639831435387922, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (82582711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41291390 + 41291391.

It is an arithmetic number, because the mean of its divisors is an integer number (41291391).

Almost surely, 2^82582781 is an apocalyptic number.

It is an amenable number.

82582781 is a deficient number, since it is larger than the sum of its proper divisors (1).

82582781 is an equidigital number, since it uses as much as digits as its factorization.

82582781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 71680, while the sum is 41.

The square root of 82582781 is about 9087.5068638213. The cubic root of 82582781 is about 435.4749399334.

The spelling of 82582781 in words is "eighty-two million, five hundred eighty-two thousand, seven hundred eighty-one".