2164581349 has 4 divisors (see below), whose sum is σ = 2473807264. Its totient is φ = 1855355436.

The previous prime is 2164581337. The next prime is 2164581379. The reversal of 2164581349 is 9431854612.

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 2164581349 - 2⁵ = 2164581317 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2164581329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 154612947 + ... + 154612960.

It is an arithmetic number, because the mean of its divisors is an integer number (618451816).

Almost surely, 2^2164581349 is an apocalyptic number.

It is an amenable number.

2164581349 is a deficient number, since it is larger than the sum of its proper divisors (309225915).

2164581349 is an equidigital number, since it uses as much as digits as its factorization.

2164581349 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 309225914.

The product of its digits is 207360, while the sum is 43.

The square root of 2164581349 is about 46525.0615152737. The cubic root of 2164581349 is about 1293.5740776485.

The spelling of 2164581349 in words is "two billion, one hundred sixty-four million, five hundred eighty-one thousand, three hundred forty-nine".