221254249 has 2 divisors, whose sum is σ = 221254250. Its totient is φ = 221254248.

The previous prime is 221254199. The next prime is 221254283. The reversal of 221254249 is 942452122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 217857600 + 3396649 = 14760^2 + 1843^2 .

It is a cyclic number.

It is not a de Polignac number, because 221254249 - 2⁹ = 221253737 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 221254249.

It is not a weakly prime, because it can be changed into another prime (221254289) 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, 110627124 + 110627125.

It is an arithmetic number, because the mean of its divisors is an integer number (110627125).

Almost surely, 2^221254249 is an apocalyptic number.

It is an amenable number.

221254249 is a deficient number, since it is larger than the sum of its proper divisors (1).

221254249 is an equidigital number, since it uses as much as digits as its factorization.

221254249 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11520, while the sum is 31.

The square root of 221254249 is about 14874.6176085303. The cubic root of 221254249 is about 604.8261221970.

The spelling of 221254249 in words is "two hundred twenty-one million, two hundred fifty-four thousand, two hundred forty-nine".