2217171849 has 4 divisors (see below), whose sum is σ = 2956229136. Its totient is φ = 1478114564.

The previous prime is 2217171799. The next prime is 2217171877. The reversal of 2217171849 is 9481717122.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2217171849 - 2⁷ = 2217171721 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2217171849.

It is not an unprimeable number, because it can be changed into a prime (2217171889) 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, 369528639 + ... + 369528644.

It is an arithmetic number, because the mean of its divisors is an integer number (739057284).

Almost surely, 2^2217171849 is an apocalyptic number.

It is an amenable number.

2217171849 is a deficient number, since it is larger than the sum of its proper divisors (739057287).

2217171849 is an equidigital number, since it uses as much as digits as its factorization.

2217171849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 739057286.

The product of its digits is 56448, while the sum is 42.

The square root of 2217171849 is about 47086.8543120052. The cubic root of 2217171849 is about 1303.9665534049.

The spelling of 2217171849 in words is "two billion, two hundred seventeen million, one hundred seventy-one thousand, eight hundred forty-nine".