209149663 has 16 divisors (see below), whose sum is σ = 225228640. Its totient is φ = 193622400.

The previous prime is 209149621. The next prime is 209149667. The reversal of 209149663 is 366941902.

It is a cyclic number.

It is not a de Polignac number, because 209149663 - 2²¹ = 207052511 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (209149667) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 209281 + ... + 210277.

It is an arithmetic number, because the mean of its divisors is an integer number (14076790).

Almost surely, 2^209149663 is an apocalyptic number.

209149663 is a deficient number, since it is larger than the sum of its proper divisors (16078977).

209149663 is a wasteful number, since it uses less digits than its factorization.

209149663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1258.

The product of its (nonzero) digits is 69984, while the sum is 40.

The square root of 209149663 is about 14462.0075715649. The cubic root of 209149663 is about 593.5888342927.

The spelling of 209149663 in words is "two hundred nine million, one hundred forty-nine thousand, six hundred sixty-three".