1285799512729 has 2 divisors, whose sum is σ = 1285799512730. Its totient is φ = 1285799512728.

The previous prime is 1285799512703. The next prime is 1285799512733. The reversal of 1285799512729 is 9272159975821.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1266165057600 + 19634455129 = 1125240^2 + 140123^2 .

It is a cyclic number.

It is not a de Polignac number, because 1285799512729 - 2⁷ = 1285799512601 is a prime.

It is not a weakly prime, because it can be changed into another prime (1285719512729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 642899756364 + 642899756365.

It is an arithmetic number, because the mean of its divisors is an integer number (642899756365).

Almost surely, 2^{1285799512729} is an apocalyptic number.

It is an amenable number.

1285799512729 is a deficient number, since it is larger than the sum of its proper divisors (1).

1285799512729 is an equidigital number, since it uses as much as digits as its factorization.

1285799512729 is an evil number, because the sum of its binary digits is even.

The product of its digits is 57153600, while the sum is 67.

The spelling of 1285799512729 in words is "one trillion, two hundred eighty-five billion, seven hundred ninety-nine million, five hundred twelve thousand, seven hundred twenty-nine".