209105013 has 32 divisors (see below), whose sum is σ = 326287360. Its totient is φ = 117961920.

The previous prime is 209104999. The next prime is 209105023. The reversal of 209105013 is 310501902.

It is not a de Polignac number, because 209105013 - 2¹⁰ = 209103989 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 (209105023) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 18420 + ... + 27522.

It is an arithmetic number, because the mean of its divisors is an integer number (10196480).

Almost surely, 2^209105013 is an apocalyptic number.

It is an amenable number.

209105013 is a deficient number, since it is larger than the sum of its proper divisors (117182347).

209105013 is a wasteful number, since it uses less digits than its factorization.

209105013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9169.

The product of its (nonzero) digits is 270, while the sum is 21.

The square root of 209105013 is about 14460.4637892427. The cubic root of 209105013 is about 593.5465908145.

Adding to 209105013 its reverse (310501902), we get a palindrome (519606915).

The spelling of 209105013 in words is "two hundred nine million, one hundred five thousand, thirteen".