11206981171 has 4 divisors (see below), whose sum is σ = 11509872592. Its totient is φ = 10904089752.

The previous prime is 11206981153. The next prime is 11206981189. The reversal of 11206981171 is 17118960211.

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (11206981153) and next prime (11206981189).

It is a cyclic number.

It is not a de Polignac number, because 11206981171 - 2⁵ = 11206981139 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37), and also a Moran number because the ratio is a prime number: 302891383 = 11206981171 / (1 + 1 + 2 + 0 + 6 + 9 + 8 + 1 + 1 + 7 + 1).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11206981171.

It is not an unprimeable number, because it can be changed into a prime (11206981871) 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, 151445655 + ... + 151445728.

It is an arithmetic number, because the mean of its divisors is an integer number (2877468148).

Almost surely, 2^11206981171 is an apocalyptic number.

11206981171 is a deficient number, since it is larger than the sum of its proper divisors (302891421).

11206981171 is an equidigital number, since it uses as much as digits as its factorization.

11206981171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 302891420.

The product of its (nonzero) digits is 6048, while the sum is 37.

The spelling of 11206981171 in words is "eleven billion, two hundred six million, nine hundred eighty-one thousand, one hundred seventy-one".