209680231489 has 4 divisors (see below), whose sum is σ = 209730675924. Its totient is φ = 209629787056.

The previous prime is 209680231477. The next prime is 209680231601. The reversal of 209680231489 is 984132086902.

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

It can be written as a sum of positive squares in 2 ways, for example, as 137869630864 + 71810600625 = 371308^2 + 267975^2 .

It is a cyclic number.

It is not a de Polignac number, because 209680231489 - 2¹³ = 209680223297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (209680331489) 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, 25215982 + ... + 25224295.

It is an arithmetic number, because the mean of its divisors is an integer number (52432668981).

Almost surely, 2^209680231489 is an apocalyptic number.

It is an amenable number.

209680231489 is a deficient number, since it is larger than the sum of its proper divisors (50444435).

209680231489 is an equidigital number, since it uses as much as digits as its factorization.

209680231489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50444434.

The product of its (nonzero) digits is 1492992, while the sum is 52.

The spelling of 209680231489 in words is "two hundred nine billion, six hundred eighty million, two hundred thirty-one thousand, four hundred eighty-nine".