2194521918 has 16 divisors (see below), whose sum is σ = 4392806016. Its totient is φ = 730880280.

The previous prime is 2194521913. The next prime is 2194521919. The reversal of 2194521918 is 8191254912.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 2194521918.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2194521913) 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 7 ways as a sum of consecutive naturals, for example, 149146 + ... + 163197.

It is an arithmetic number, because the mean of its divisors is an integer number (274550376).

Almost surely, 2^2194521918 is an apocalyptic number.

2194521918 is an abundant number, since it is smaller than the sum of its proper divisors (2198284098).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2194521918 is a wasteful number, since it uses less digits than its factorization.

2194521918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 313519.

The product of its digits is 51840, while the sum is 42.

The square root of 2194521918 is about 46845.7246501749. The cubic root of 2194521918 is about 1299.5110425458.

The spelling of 2194521918 in words is "two billion, one hundred ninety-four million, five hundred twenty-one thousand, nine hundred eighteen".