11011020509 has 2 divisors, whose sum is σ = 11011020510. Its totient is φ = 11011020508.

The previous prime is 11011020491. The next prime is 11011020539. The reversal of 11011020509 is 90502011011.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8982869284 + 2028151225 = 94778^2 + 45035^2 .

It is a cyclic number.

It is not a de Polignac number, because 11011020509 - 2¹² = 11011016413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11011020539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5505510254 + 5505510255.

It is an arithmetic number, because the mean of its divisors is an integer number (5505510255).

Almost surely, 2^11011020509 is an apocalyptic number.

It is an amenable number.

11011020509 is a deficient number, since it is larger than the sum of its proper divisors (1).

11011020509 is an equidigital number, since it uses as much as digits as its factorization.

11011020509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 90, while the sum is 20.

The spelling of 11011020509 in words is "eleven billion, eleven million, twenty thousand, five hundred nine".