1321000081 has 2 divisors, whose sum is σ = 1321000082. Its totient is φ = 1321000080.

The previous prime is 1321000067. The next prime is 1321000127. The reversal of 1321000081 is 1800001231.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1058851600 + 262148481 = 32540^2 + 16191^2 .

It is a cyclic number.

It is not a de Polignac number, because 1321000081 - 2²¹ = 1318902929 is a prime.

It is a super-2 number, since 2×1321000081² = 3490082428004013122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1321000981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660500040 + 660500041.

It is an arithmetic number, because the mean of its divisors is an integer number (660500041).

Almost surely, 2^1321000081 is an apocalyptic number.

It is an amenable number.

1321000081 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321000081 is an equidigital number, since it uses as much as digits as its factorization.

1321000081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48, while the sum is 16.

The square root of 1321000081 is about 36345.5648050763. The cubic root of 1321000081 is about 1097.2382734223.

The spelling of 1321000081 in words is "one billion, three hundred twenty-one million, eighty-one", and thus it is an aban number.