11812280111 has 4 divisors (see below), whose sum is σ = 11833040400. Its totient is φ = 11791519824.

The previous prime is 11812280089. The next prime is 11812280141. The reversal of 11812280111 is 11108221811.

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 11812280111 - 2²⁶ = 11745171247 is a prime.

It is a super-2 number, since 2×11812280111² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11812280141) 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, 10379291 + ... + 10380428.

It is an arithmetic number, because the mean of its divisors is an integer number (2958260100).

Almost surely, 2^11812280111 is an apocalyptic number.

11812280111 is a deficient number, since it is larger than the sum of its proper divisors (20760289).

11812280111 is an equidigital number, since it uses as much as digits as its factorization.

11812280111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20760288.

The product of its (nonzero) digits is 256, while the sum is 26.

The spelling of 11812280111 in words is "eleven billion, eight hundred twelve million, two hundred eighty thousand, one hundred eleven".