213227809 has 2 divisors, whose sum is σ = 213227810. Its totient is φ = 213227808.

The previous prime is 213227803. The next prime is 213227837. The reversal of 213227809 is 908722312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 196784784 + 16443025 = 14028^2 + 4055^2 .

It is a cyclic number.

It is not a de Polignac number, because 213227809 - 2⁷ = 213227681 is a prime.

It is not a weakly prime, because it can be changed into another prime (213227803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106613904 + 106613905.

It is an arithmetic number, because the mean of its divisors is an integer number (106613905).

Almost surely, 2^213227809 is an apocalyptic number.

It is an amenable number.

213227809 is a deficient number, since it is larger than the sum of its proper divisors (1).

213227809 is an equidigital number, since it uses as much as digits as its factorization.

213227809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 213227809 is about 14602.3220413741. The cubic root of 213227809 is about 597.4220963656.

The spelling of 213227809 in words is "two hundred thirteen million, two hundred twenty-seven thousand, eight hundred nine".