209481383 has 4 divisors (see below), whose sum is σ = 215143080. Its totient is φ = 203819688.

The previous prime is 209481379. The next prime is 209481407. The reversal of 209481383 is 383184902.

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

It is a cyclic number.

It is not a de Polignac number, because 209481383 - 2² = 209481379 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 (209481313) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2830793 + ... + 2830866.

It is an arithmetic number, because the mean of its divisors is an integer number (53785770).

Almost surely, 2^209481383 is an apocalyptic number.

209481383 is a deficient number, since it is larger than the sum of its proper divisors (5661697).

209481383 is an equidigital number, since it uses as much as digits as its factorization.

209481383 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5661696.

The product of its (nonzero) digits is 41472, while the sum is 38.

The square root of 209481383 is about 14473.4716982485. The cubic root of 209481383 is about 593.9024873278.

The spelling of 209481383 in words is "two hundred nine million, four hundred eighty-one thousand, three hundred eighty-three".