1028547081409 has 2 divisors, whose sum is σ = 1028547081410. Its totient is φ = 1028547081408.

The previous prime is 1028547081403. The next prime is 1028547081433. The reversal of 1028547081409 is 9041807458201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1014798346384 + 13748735025 = 1007372^2 + 117255^2 .

It is a cyclic number.

It is not a de Polignac number, because 1028547081409 - 2⁷ = 1028547081281 is a prime.

It is not a weakly prime, because it can be changed into another prime (1028547081403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 514273540704 + 514273540705.

It is an arithmetic number, because the mean of its divisors is an integer number (514273540705).

Almost surely, 2^{1028547081409} is an apocalyptic number.

It is an amenable number.

1028547081409 is a deficient number, since it is larger than the sum of its proper divisors (1).

1028547081409 is an equidigital number, since it uses as much as digits as its factorization.

1028547081409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 645120, while the sum is 49.

The spelling of 1028547081409 in words is "one trillion, twenty-eight billion, five hundred forty-seven million, eighty-one thousand, four hundred nine".