899221 has 2 divisors, whose sum is σ = 899222. Its totient is φ = 899220.

The previous prime is 899209. The next prime is 899233. The reversal of 899221 is 122998.

It is a balanced prime because it is at equal distance from previous prime (899209) and next prime (899233).

It can be written as a sum of positive squares in only one way, i.e., 790321 + 108900 = 889^2 + 330^2 .

It is a cyclic number.

It is not a de Polignac number, because 899221 - 2⁵ = 899189 is a prime.

899221 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (899291) 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, 449610 + 449611.

It is an arithmetic number, because the mean of its divisors is an integer number (449611).

2⁸⁹⁹²²¹ is an apocalyptic number.

It is an amenable number.

899221 is a deficient number, since it is larger than the sum of its proper divisors (1).

899221 is an equidigital number, since it uses as much as digits as its factorization.

899221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2592, while the sum is 31.

The square root of 899221 is about 948.2726401199. The cubic root of 899221 is about 96.5210742630.

The spelling of 899221 in words is "eight hundred ninety-nine thousand, two hundred twenty-one".