2194218545 has 4 divisors (see below), whose sum is σ = 2633062260. Its totient is φ = 1755374832.

The previous prime is 2194218541. The next prime is 2194218563. The reversal of 2194218545 is 5458124912.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1072169536 + 1122049009 = 32744^2 + 33497^2 .

It is a cyclic number.

It is not a de Polignac number, because 2194218545 - 2² = 2194218541 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2194218541) 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, 219421850 + ... + 219421859.

It is an arithmetic number, because the mean of its divisors is an integer number (658265565).

Almost surely, 2^2194218545 is an apocalyptic number.

It is an amenable number.

2194218545 is a deficient number, since it is larger than the sum of its proper divisors (438843715).

2194218545 is an equidigital number, since it uses as much as digits as its factorization.

2194218545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 438843714.

The product of its digits is 115200, while the sum is 41.

The square root of 2194218545 is about 46842.4865373306. The cubic root of 2194218545 is about 1299.4511578654.

The spelling of 2194218545 in words is "two billion, one hundred ninety-four million, two hundred eighteen thousand, five hundred forty-five".