11279077209 has 9 divisors (see below), whose sum is σ = 16292460639. Its totient is φ = 7519172400.

The previous prime is 11279077207. The next prime is 11279077223. The reversal of 11279077209 is 90277097211.

It is a happy number.

The square root of 11279077209 is 106203.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 2246475609 + 9032601600 = 47397^2 + 95040^2 .

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 11279077209 - 2¹ = 11279077207 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11279077207) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 300909 + ... + 336309.

Almost surely, 2^11279077209 is an apocalyptic number.

11279077209 is the 106203-rd square number.

11279077209 is the 53102-nd centered octagonal number.

It is an amenable number.

11279077209 is a deficient number, since it is larger than the sum of its proper divisors (5013383430).

11279077209 is an frugal number, since it uses more digits than its factorization.

11279077209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70808 (or 35404 counting only the distinct ones).

The product of its (nonzero) digits is 111132, while the sum is 45.

The spelling of 11279077209 in words is "eleven billion, two hundred seventy-nine million, seventy-seven thousand, two hundred nine".