1288366081 has 2 divisors, whose sum is σ = 1288366082. Its totient is φ = 1288366080.

The previous prime is 1288366069. The next prime is 1288366109. The reversal of 1288366081 is 1806638821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 946116081 + 342250000 = 30759^2 + 18500^2 .

It is a cyclic number.

It is not a de Polignac number, because 1288366081 - 2⁹ = 1288365569 is a prime.

It is a super-2 number, since 2×1288366081² = 3319774317342597122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1288366031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 644183040 + 644183041.

It is an arithmetic number, because the mean of its divisors is an integer number (644183041).

Almost surely, 2^1288366081 is an apocalyptic number.

It is an amenable number.

1288366081 is a deficient number, since it is larger than the sum of its proper divisors (1).

1288366081 is an equidigital number, since it uses as much as digits as its factorization.

1288366081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 110592, while the sum is 43.

The square root of 1288366081 is about 35893.8167516356. The cubic root of 1288366081 is about 1088.1274363349.

The spelling of 1288366081 in words is "one billion, two hundred eighty-eight million, three hundred sixty-six thousand, eighty-one".