1101001009 has 2 divisors, whose sum is σ = 1101001010. Its totient is φ = 1101001008.

The previous prime is 1101001001. The next prime is 1101001019. The reversal of 1101001009 is 9001001011.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1033301025 + 67699984 = 32145^2 + 8228^2 .

It is an emirp because it is prime and its reverse (9001001011) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1101001009 - 2³ = 1101001001 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1101001009.

It is not a weakly prime, because it can be changed into another prime (1101001001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 550500504 + 550500505.

It is an arithmetic number, because the mean of its divisors is an integer number (550500505).

Almost surely, 2^1101001009 is an apocalyptic number.

It is an amenable number.

1101001009 is a deficient number, since it is larger than the sum of its proper divisors (1).

1101001009 is an equidigital number, since it uses as much as digits as its factorization.

1101001009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9, while the sum is 13.

The square root of 1101001009 is about 33181.3352504085. The cubic root of 1101001009 is about 1032.5931483051.

The spelling of 1101001009 in words is "one billion, one hundred one million, one thousand, nine".