1231775670805 has 16 divisors (see below), whose sum is σ = 1479431142000. Its totient is φ = 984553873408.

The previous prime is 1231775670793. The next prime is 1231775670869. The reversal of 1231775670805 is 5080765771321.

It can be written as a sum of positive squares in 8 ways, for example, as 7032835044 + 1224742835761 = 83862^2 + 1106681^2 .

It is a cyclic number.

It is not a de Polignac number, because 1231775670805 - 2⁷ = 1231775670677 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 78205071 + ... + 78220819.

It is an arithmetic number, because the mean of its divisors is an integer number (92464446375).

Almost surely, 2^{1231775670805} is an apocalyptic number.

It is an amenable number.

1231775670805 is a deficient number, since it is larger than the sum of its proper divisors (247655471195).

1231775670805 is a wasteful number, since it uses less digits than its factorization.

1231775670805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28520.

The product of its (nonzero) digits is 2469600, while the sum is 52.

The spelling of 1231775670805 in words is "one trillion, two hundred thirty-one billion, seven hundred seventy-five million, six hundred seventy thousand, eight hundred five".