81282601 has 2 divisors, whose sum is σ = 81282602. Its totient is φ = 81282600.

The previous prime is 81282587. The next prime is 81282611. The reversal of 81282601 is 10628218.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 80568576 + 714025 = 8976^2 + 845^2 .

It is a cyclic number.

It is not a de Polignac number, because 81282601 - 2⁵ = 81282569 is a prime.

It is a super-2 number, since 2×81282601² = 13213722450650402, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 81282601.

It is not a weakly prime, because it can be changed into another prime (81282611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40641300 + 40641301.

It is an arithmetic number, because the mean of its divisors is an integer number (40641301).

Almost surely, 2^81282601 is an apocalyptic number.

It is an amenable number.

81282601 is a deficient number, since it is larger than the sum of its proper divisors (1).

81282601 is an equidigital number, since it uses as much as digits as its factorization.

81282601 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1536, while the sum is 28.

The square root of 81282601 is about 9015.6863854063. The cubic root of 81282601 is about 433.1774736650.

The spelling of 81282601 in words is "eighty-one million, two hundred eighty-two thousand, six hundred one".