2194619639 has 4 divisors (see below), whose sum is σ = 2227375224. Its totient is φ = 2161864056.

The previous prime is 2194619629. The next prime is 2194619663. The reversal of 2194619639 is 9369164912.

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 2194619639 - 2¹² = 2194615543 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 (2194619629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16377692 + ... + 16377825.

It is an arithmetic number, because the mean of its divisors is an integer number (556843806).

Almost surely, 2^2194619639 is an apocalyptic number.

2194619639 is a deficient number, since it is larger than the sum of its proper divisors (32755585).

2194619639 is an equidigital number, since it uses as much as digits as its factorization.

2194619639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32755584.

The product of its digits is 629856, while the sum is 50.

The square root of 2194619639 is about 46846.7676472988. The cubic root of 2194619639 is about 1299.5303311257.

The spelling of 2194619639 in words is "two billion, one hundred ninety-four million, six hundred nineteen thousand, six hundred thirty-nine".