221000591449 has 9 divisors (see below), whose sum is σ = 242923689631. Its totient is φ = 200904927520.

The previous prime is 221000591431. The next prime is 221000591459. The reversal of 221000591449 is 944195000122.

The square root of 221000591449 is 470107.

It is a perfect power (a square), and thus also a powerful number.

221000591449 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 160893243225 + 60107348224 = 401115^2 + 245168^2 .

It is not a de Polignac number, because 221000591449 - 2⁵ = 221000591417 is a prime.

It is a super-2 number, since 2×221000591449² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221000591459) 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 8 ways as a sum of consecutive naturals, for example, 5149809 + ... + 5192545.

Almost surely, 2^221000591449 is an apocalyptic number.

221000591449 is the 470107-th square number.

221000591449 is the 235054-th centered octagonal number.

It is an amenable number.

221000591449 is a deficient number, since it is larger than the sum of its proper divisors (21923098182).

221000591449 is an frugal number, since it uses more digits than its factorization.

221000591449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85496 (or 42748 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 37.

The spelling of 221000591449 in words is "two hundred twenty-one billion, five hundred ninety-one thousand, four hundred forty-nine".