2209985917 has 4 divisors (see below), whose sum is σ = 2219232960. Its totient is φ = 2200738876.

The previous prime is 2209985863. The next prime is 2209985923. The reversal of 2209985917 is 7195899022.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2209985917 - 2²³ = 2201597309 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 (2209985117) 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 3 ways as a sum of consecutive naturals, for example, 4623163 + ... + 4623640.

It is an arithmetic number, because the mean of its divisors is an integer number (554808240).

Almost surely, 2^2209985917 is an apocalyptic number.

It is an amenable number.

2209985917 is a deficient number, since it is larger than the sum of its proper divisors (9247043).

2209985917 is an equidigital number, since it uses as much as digits as its factorization.

2209985917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9247042.

The product of its (nonzero) digits is 816480, while the sum is 52.

The square root of 2209985917 is about 47010.4873086846. The cubic root of 2209985917 is about 1302.5562949083.

The spelling of 2209985917 in words is "two billion, two hundred nine million, nine hundred eighty-five thousand, nine hundred seventeen".