11545220909 has 2 divisors, whose sum is σ = 11545220910. Its totient is φ = 11545220908.

The previous prime is 11545220899. The next prime is 11545220969. The reversal of 11545220909 is 90902254511.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5837418409 + 5707802500 = 76403^2 + 75550^2 .

It is a cyclic number.

It is not a de Polignac number, because 11545220909 - 2¹⁶ = 11545155373 is a prime.

It is a super-2 number, since 2×11545220909² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11545220969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5772610454 + 5772610455.

It is an arithmetic number, because the mean of its divisors is an integer number (5772610455).

Almost surely, 2^11545220909 is an apocalyptic number.

It is an amenable number.

11545220909 is a deficient number, since it is larger than the sum of its proper divisors (1).

11545220909 is an equidigital number, since it uses as much as digits as its factorization.

11545220909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32400, while the sum is 38.

The spelling of 11545220909 in words is "eleven billion, five hundred forty-five million, two hundred twenty thousand, nine hundred nine".