2221544197 has 2 divisors, whose sum is σ = 2221544198. Its totient is φ = 2221544196.

The previous prime is 2221544189. The next prime is 2221544209. The reversal of 2221544197 is 7914451222.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2205335521 + 16208676 = 46961^2 + 4026^2 .

It is a cyclic number.

It is not a de Polignac number, because 2221544197 - 2³ = 2221544189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2221544107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1110772098 + 1110772099.

It is an arithmetic number, because the mean of its divisors is an integer number (1110772099).

Almost surely, 2^2221544197 is an apocalyptic number.

It is an amenable number.

2221544197 is a deficient number, since it is larger than the sum of its proper divisors (1).

2221544197 is an equidigital number, since it uses as much as digits as its factorization.

2221544197 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40320, while the sum is 37.

The square root of 2221544197 is about 47133.2599869773. The cubic root of 2221544197 is about 1304.8231479392.

The spelling of 2221544197 in words is "two billion, two hundred twenty-one million, five hundred forty-four thousand, one hundred ninety-seven".