209701489 has 4 divisors (see below), whose sum is σ = 211661424. Its totient is φ = 207741556.

The previous prime is 209701447. The next prime is 209701501. The reversal of 209701489 is 984107902.

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 209701489 - 2⁷ = 209701361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (209704489) 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, 979807 + ... + 980020.

It is an arithmetic number, because the mean of its divisors is an integer number (52915356).

Almost surely, 2^209701489 is an apocalyptic number.

It is an amenable number.

209701489 is a deficient number, since it is larger than the sum of its proper divisors (1959935).

209701489 is a wasteful number, since it uses less digits than its factorization.

209701489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1959934.

The product of its (nonzero) digits is 36288, while the sum is 40.

The square root of 209701489 is about 14481.0734754023. The cubic root of 209701489 is about 594.1104226614.

The spelling of 209701489 in words is "two hundred nine million, seven hundred one thousand, four hundred eighty-nine".