213468209 has 2 divisors, whose sum is σ = 213468210. Its totient is φ = 213468208.

The previous prime is 213468169. The next prime is 213468239. The reversal of 213468209 is 902864312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 208715809 + 4752400 = 14447^2 + 2180^2 .

It is a cyclic number.

It is not a de Polignac number, because 213468209 - 2¹² = 213464113 is a prime.

It is a nialpdrome in base 16.

It is not a weakly prime, because it can be changed into another prime (213468239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106734104 + 106734105.

It is an arithmetic number, because the mean of its divisors is an integer number (106734105).

Almost surely, 2^213468209 is an apocalyptic number.

It is an amenable number.

213468209 is a deficient number, since it is larger than the sum of its proper divisors (1).

213468209 is an equidigital number, since it uses as much as digits as its factorization.

213468209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20736, while the sum is 35.

The square root of 213468209 is about 14610.5512900780. The cubic root of 213468209 is about 597.6465297738.

The spelling of 213468209 in words is "two hundred thirteen million, four hundred sixty-eight thousand, two hundred nine".