221599849 has 2 divisors, whose sum is σ = 221599850. Its totient is φ = 221599848.

The previous prime is 221599813. The next prime is 221599853. The reversal of 221599849 is 948995122.

221599849 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 214417449 + 7182400 = 14643^2 + 2680^2 .

It is a cyclic number.

It is not a de Polignac number, because 221599849 - 2¹⁵ = 221567081 is a prime.

It is not a weakly prime, because it can be changed into another prime (221599249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110799924 + 110799925.

It is an arithmetic number, because the mean of its divisors is an integer number (110799925).

Almost surely, 2^221599849 is an apocalyptic number.

It is an amenable number.

221599849 is a deficient number, since it is larger than the sum of its proper divisors (1).

221599849 is an equidigital number, since it uses as much as digits as its factorization.

221599849 is an evil number, because the sum of its binary digits is even.

The product of its digits is 466560, while the sum is 49.

The square root of 221599849 is about 14886.2301809424. The cubic root of 221599849 is about 605.1408719611.

The spelling of 221599849 in words is "two hundred twenty-one million, five hundred ninety-nine thousand, eight hundred forty-nine".