1011278033809 has 4 divisors (see below), whose sum is σ = 1011522721716. Its totient is φ = 1011033345904.

The previous prime is 1011278033789. The next prime is 1011278033813. The reversal of 1011278033809 is 9083308721101.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 397675278225 + 613602755584 = 630615^2 + 783328^2 .

It is a cyclic number.

It is not a de Polignac number, because 1011278033809 - 2¹¹ = 1011278031761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1011278033869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 122337754 + ... + 122346019.

It is an arithmetic number, because the mean of its divisors is an integer number (252880680429).

Almost surely, 2^{1011278033809} is an apocalyptic number.

It is an amenable number.

1011278033809 is a deficient number, since it is larger than the sum of its proper divisors (244687907).

1011278033809 is an equidigital number, since it uses as much as digits as its factorization.

1011278033809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 244687906.

The product of its (nonzero) digits is 72576, while the sum is 43.

The spelling of 1011278033809 in words is "one trillion, eleven billion, two hundred seventy-eight million, thirty-three thousand, eight hundred nine".