209117254 has 4 divisors (see below), whose sum is σ = 313675884. Its totient is φ = 104558626.

The previous prime is 209117243. The next prime is 209117257. The reversal of 209117254 is 452711902.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (209117257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 52279312 + ... + 52279315.

It is an arithmetic number, because the mean of its divisors is an integer number (78418971).

Almost surely, 2^209117254 is an apocalyptic number.

209117254 is a deficient number, since it is larger than the sum of its proper divisors (104558630).

209117254 is a wasteful number, since it uses less digits than its factorization.

209117254 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104558629.

The product of its (nonzero) digits is 5040, while the sum is 31.

The square root of 209117254 is about 14460.8870405657. The cubic root of 209117254 is about 593.5581726539.

The spelling of 209117254 in words is "two hundred nine million, one hundred seventeen thousand, two hundred fifty-four".