1100155547609 has 2 divisors, whose sum is σ = 1100155547610. Its totient is φ = 1100155547608.

The previous prime is 1100155547591. The next prime is 1100155547611. The reversal of 1100155547609 is 9067455510011.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 938567627209 + 161587920400 = 968797^2 + 401980^2 .

It is a cyclic number.

It is not a de Polignac number, because 1100155547609 - 2⁸ = 1100155547353 is a prime.

It is a Sophie Germain prime.

Together with 1100155547611, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1100155547609.

It is not a weakly prime, because it can be changed into another prime (1100155547629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 550077773804 + 550077773805.

It is an arithmetic number, because the mean of its divisors is an integer number (550077773805).

Almost surely, 2^{1100155547609} is an apocalyptic number.

It is an amenable number.

1100155547609 is a deficient number, since it is larger than the sum of its proper divisors (1).

1100155547609 is an equidigital number, since it uses as much as digits as its factorization.

1100155547609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 189000, while the sum is 44.

The spelling of 1100155547609 in words is "one trillion, one hundred billion, one hundred fifty-five million, five hundred forty-seven thousand, six hundred nine".