1011909247969 has 3 divisors (see below), whose sum is σ = 1011910253907. Its totient is φ = 1011908242032.

The previous prime is 1011909247939. The next prime is 1011909248027. The reversal of 1011909247969 is 9697429091101.

The square root of 1011909247969 is 1005937.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 808587616225 + 203321631744 = 899215^2 + 450912^2 .

It is not a de Polignac number, because 1011909247969 - 2⁷ = 1011909247841 is a prime.

It is a super-2 number, since 2×1011909247969² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1011909247939) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 502969 + ... + 1508905.

It is an arithmetic number, because the mean of its divisors is an integer number (337303417969).

Almost surely, 2^{1011909247969} is an apocalyptic number.

1011909247969 is the 1005937-th square number.

1011909247969 is the 502969-th centered octagonal number.

It is an amenable number.

1011909247969 is a deficient number, since it is larger than the sum of its proper divisors (1005938).

1011909247969 is an frugal number, since it uses more digits than its factorization.

1011909247969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2011874 (or 1005937 counting only the distinct ones).

The product of its (nonzero) digits is 2204496, while the sum is 58.

The spelling of 1011909247969 in words is "one trillion, eleven billion, nine hundred nine million, two hundred forty-seven thousand, nine hundred sixty-nine".