209149763 has 2 divisors, whose sum is σ = 209149764. Its totient is φ = 209149762.

The previous prime is 209149729. The next prime is 209149771. The reversal of 209149763 is 367941902.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 209149763 - 2²² = 204955459 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 209149763.

It is not a weakly prime, because it can be changed into another prime (209149063) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104574881 + 104574882.

It is an arithmetic number, because the mean of its divisors is an integer number (104574882).

Almost surely, 2^209149763 is an apocalyptic number.

209149763 is a deficient number, since it is larger than the sum of its proper divisors (1).

209149763 is an equidigital number, since it uses as much as digits as its factorization.

209149763 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 81648, while the sum is 41.

The square root of 209149763 is about 14462.0110288991. The cubic root of 209149763 is about 593.5889288962.

The spelling of 209149763 in words is "two hundred nine million, one hundred forty-nine thousand, seven hundred sixty-three".