209212717193 has 2 divisors, whose sum is σ = 209212717194. Its totient is φ = 209212717192.

The previous prime is 209212717169. The next prime is 209212717229. The reversal of 209212717193 is 391717212902.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 176658814864 + 32553902329 = 420308^2 + 180427^2 .

It is a cyclic number.

It is not a de Polignac number, because 209212717193 - 2²⁴ = 209195939977 is a prime.

It is a super-2 number, since 2×209212717193² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (209212717993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104606358596 + 104606358597.

It is an arithmetic number, because the mean of its divisors is an integer number (104606358597).

Almost surely, 2^209212717193 is an apocalyptic number.

It is an amenable number.

209212717193 is a deficient number, since it is larger than the sum of its proper divisors (1).

209212717193 is an equidigital number, since it uses as much as digits as its factorization.

209212717193 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 95256, while the sum is 44.

The spelling of 209212717193 in words is "two hundred nine billion, two hundred twelve million, seven hundred seventeen thousand, one hundred ninety-three".