1011231009 has 12 divisors (see below), whose sum is σ = 1546588836. Its totient is φ = 634497792.

The previous prime is 1011230993. The next prime is 1011231017. The reversal of 1011231009 is 9001321101.

It can be written as a sum of positive squares in 2 ways, for example, as 812421009 + 198810000 = 28503^2 + 14100^2 .

It is not a de Polignac number, because 1011231009 - 2⁴ = 1011230993 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1011230982 and 1011231000.

It is not an unprimeable number, because it can be changed into a prime (1011231019) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3304524 + ... + 3304829.

It is an arithmetic number, because the mean of its divisors is an integer number (128882403).

Almost surely, 2^1011231009 is an apocalyptic number.

It is an amenable number.

1011231009 is a deficient number, since it is larger than the sum of its proper divisors (535357827).

1011231009 is a wasteful number, since it uses less digits than its factorization.

1011231009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6609376 (or 6609373 counting only the distinct ones).

The product of its (nonzero) digits is 54, while the sum is 18.

The square root of 1011231009 is about 31799.8586317612. The cubic root of 1011231009 is about 1003.7297414010.

The spelling of 1011231009 in words is "one billion, eleven million, two hundred thirty-one thousand, nine".