82487381 has 2 divisors, whose sum is σ = 82487382. Its totient is φ = 82487380.

The previous prime is 82487357. The next prime is 82487387. The reversal of 82487381 is 18378428.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 81613156 + 874225 = 9034^2 + 935^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-82487381 is a prime.

It is a super-2 number, since 2×82487381² = 13608336048478322, which contains 22 as substring.

It is a Sophie Germain 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 (82487387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41243690 + 41243691.

It is an arithmetic number, because the mean of its divisors is an integer number (41243691).

Almost surely, 2^82487381 is an apocalyptic number.

It is an amenable number.

82487381 is a deficient number, since it is larger than the sum of its proper divisors (1).

82487381 is an equidigital number, since it uses as much as digits as its factorization.

82487381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 86016, while the sum is 41.

The square root of 82487381 is about 9082.2563826397. The cubic root of 82487381 is about 435.3071877845.

The spelling of 82487381 in words is "eighty-two million, four hundred eighty-seven thousand, three hundred eighty-one".