1020111131209 has 2 divisors, whose sum is σ = 1020111131210. Its totient is φ = 1020111131208.

The previous prime is 1020111131183. The next prime is 1020111131243. The reversal of 1020111131209 is 9021311110201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 522155095609 + 497956035600 = 722603^2 + 705660^2 .

It is a cyclic number.

It is not a de Polignac number, because 1020111131209 - 2³⁵ = 985751392841 is a prime.

It is a super-2 number, since 2×1020111131209² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1020111131209.

It is not a weakly prime, because it can be changed into another prime (1020111134209) by changing a digit.

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 as a sum of consecutive naturals, namely, 510055565604 + 510055565605.

It is an arithmetic number, because the mean of its divisors is an integer number (510055565605).

Almost surely, 2^{1020111131209} is an apocalyptic number.

It is an amenable number.

1020111131209 is a deficient number, since it is larger than the sum of its proper divisors (1).

1020111131209 is an equidigital number, since it uses as much as digits as its factorization.

1020111131209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108, while the sum is 22.

The spelling of 1020111131209 in words is "one trillion, twenty billion, one hundred eleven million, one hundred thirty-one thousand, two hundred nine".