209113047 has 36 divisors (see below), whose sum is σ = 357571032. Its totient is φ = 116978400.

The previous prime is 209113019. The next prime is 209113087. The reversal of 209113047 is 740311902.

It is not a de Polignac number, because 209113047 - 2⁷ = 209112919 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 209113047.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (209113087) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 6772 + ... + 21542.

Almost surely, 2^209113047 is an apocalyptic number.

209113047 is a deficient number, since it is larger than the sum of its proper divisors (148457985).

209113047 is a wasteful number, since it uses less digits than its factorization.

209113047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14812 (or 14798 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 27.

The square root of 209113047 is about 14460.7415784945. The cubic root of 209113047 is about 593.5541922459.

Adding to 209113047 its reverse (740311902), we get a palindrome (949424949).

The spelling of 209113047 in words is "two hundred nine million, one hundred thirteen thousand, forty-seven".