1020111311309 has 4 divisors (see below), whose sum is σ = 1020745316220. Its totient is φ = 1019477306400.

The previous prime is 1020111311287. The next prime is 1020111311321. The reversal of 1020111311309 is 9031131110201.

It is a happy number.

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 650921399209 + 369189912100 = 806797^2 + 607610^2 .

It is a cyclic number.

It is not a de Polignac number, because 1020111311309 - 2²⁰ = 1020110262733 is a prime.

It is a super-2 number, since 2×1020111311309² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1020111311339) 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, 317000042 + ... + 317003259.

It is an arithmetic number, because the mean of its divisors is an integer number (255186329055).

Almost surely, 2^{1020111311309} is an apocalyptic number.

It is an amenable number.

1020111311309 is a deficient number, since it is larger than the sum of its proper divisors (634004911).

1020111311309 is an equidigital number, since it uses as much as digits as its factorization.

1020111311309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 634004910.

The product of its (nonzero) digits is 162, while the sum is 23.

The spelling of 1020111311309 in words is "one trillion, twenty billion, one hundred eleven million, three hundred eleven thousand, three hundred nine".