2193956209 has 2 divisors, whose sum is σ = 2193956210. Its totient is φ = 2193956208.

The previous prime is 2193956203. The next prime is 2193956221. The reversal of 2193956209 is 9026593912.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1544725809 + 649230400 = 39303^2 + 25480^2 .

It is a cyclic number.

It is not a de Polignac number, because 2193956209 - 2¹⁵ = 2193923441 is a prime.

It is not a weakly prime, because it can be changed into another prime (2193956203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1096978104 + 1096978105.

It is an arithmetic number, because the mean of its divisors is an integer number (1096978105).

Almost surely, 2^2193956209 is an apocalyptic number.

It is an amenable number.

2193956209 is a deficient number, since it is larger than the sum of its proper divisors (1).

2193956209 is an equidigital number, since it uses as much as digits as its factorization.

2193956209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 262440, while the sum is 46.

The square root of 2193956209 is about 46839.6862606914. The cubic root of 2193956209 is about 1299.3993692827.

The spelling of 2193956209 in words is "two billion, one hundred ninety-three million, nine hundred fifty-six thousand, two hundred nine".