11287878211 has 4 divisors (see below), whose sum is σ = 11288751624. Its totient is φ = 11287004800.

The previous prime is 11287878209. The next prime is 11287878221.

It is a happy number.

11287878211 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 11287878211 - 2¹ = 11287878209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11287878221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 417025 + ... + 443266.

It is an arithmetic number, because the mean of its divisors is an integer number (2822187906).

Almost surely, 2^11287878211 is an apocalyptic number.

11287878211 is a deficient number, since it is larger than the sum of its proper divisors (873413).

11287878211 is an equidigital number, since it uses as much as digits as its factorization.

11287878211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 873412.

The product of its digits is 100352, while the sum is 46.

The spelling of 11287878211 in words is "eleven billion, two hundred eighty-seven million, eight hundred seventy-eight thousand, two hundred eleven".