213468109 has 2 divisors, whose sum is σ = 213468110. Its totient is φ = 213468108.

The previous prime is 213468089. The next prime is 213468121. The reversal of 213468109 is 901864312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 184362084 + 29106025 = 13578^2 + 5395^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-213468109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213468149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106734054 + 106734055.

It is an arithmetic number, because the mean of its divisors is an integer number (106734055).

Almost surely, 2^213468109 is an apocalyptic number.

It is an amenable number.

213468109 is a deficient number, since it is larger than the sum of its proper divisors (1).

213468109 is an equidigital number, since it uses as much as digits as its factorization.

213468109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 213468109 is about 14610.5478678933. The cubic root of 213468109 is about 597.6464364505.

The spelling of 213468109 in words is "two hundred thirteen million, four hundred sixty-eight thousand, one hundred nine".