1078631775209 has 2 divisors, whose sum is σ = 1078631775210. Its totient is φ = 1078631775208.

The previous prime is 1078631775197. The next prime is 1078631775241. The reversal of 1078631775209 is 9025771368701.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1053486696025 + 25145079184 = 1026395^2 + 158572^2 .

It is a cyclic number.

It is not a de Polignac number, because 1078631775209 - 2³² = 1074336807913 is a prime.

It is not a weakly prime, because it can be changed into another prime (1078631745209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 539315887604 + 539315887605.

It is an arithmetic number, because the mean of its divisors is an integer number (539315887605).

Almost surely, 2^{1078631775209} is an apocalyptic number.

It is an amenable number.

1078631775209 is a deficient number, since it is larger than the sum of its proper divisors (1).

1078631775209 is an equidigital number, since it uses as much as digits as its factorization.

1078631775209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4445280, while the sum is 56.

The spelling of 1078631775209 in words is "one trillion, seventy-eight billion, six hundred thirty-one million, seven hundred seventy-five thousand, two hundred nine".