209450871 has 24 divisors (see below), whose sum is σ = 349194144. Its totient is φ = 118497600.

The previous prime is 209450861. The next prime is 209450873. The reversal of 209450871 is 178054902.

It is not a de Polignac number, because 209450871 - 2²³ = 201062263 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (209450873) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10096 + ... + 22821.

It is an arithmetic number, because the mean of its divisors is an integer number (14549756).

Almost surely, 2^209450871 is an apocalyptic number.

209450871 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

209450871 is a deficient number, since it is larger than the sum of its proper divisors (139743273).

209450871 is a wasteful number, since it uses less digits than its factorization.

209450871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33031 (or 33028 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The square root of 209450871 is about 14472.4175934776. The cubic root of 209450871 is about 593.8736509824.

The spelling of 209450871 in words is "two hundred nine million, four hundred fifty thousand, eight hundred seventy-one".