11277802809 has 81 divisors (see below), whose sum is σ = 20572466733. Its totient is φ = 5933438784.

The previous prime is 11277802799. The next prime is 11277802867. The reversal of 11277802809 is 90820877211.

The square root of 11277802809 is 106197.

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

It can be written as a sum of positive squares in 4 ways, for example, as 4334247225 + 6943555584 = 65835^2 + 83328^2 .

It is not a de Polignac number, because 11277802809 - 2¹¹ = 11277800761 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11277802009) by changing a digit.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 28991587 + ... + 28991975.

Almost surely, 2^11277802809 is an apocalyptic number.

11277802809 is the 106197-th square number.

11277802809 is the 53099-th centered octagonal number.

It is an amenable number.

11277802809 is a deficient number, since it is larger than the sum of its proper divisors (9294663924).

11277802809 is an equidigital number, since it uses as much as digits as its factorization.

11277802809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 824 (or 412 counting only the distinct ones).

The product of its (nonzero) digits is 112896, while the sum is 45.

The spelling of 11277802809 in words is "eleven billion, two hundred seventy-seven million, eight hundred two thousand, eight hundred nine".