209610628889 has 8 divisors (see below), whose sum is σ = 210810709512. Its totient is φ = 208413116800.

The previous prime is 209610628873. The next prime is 209610628901. The reversal of 209610628889 is 988826016902.

209610628889 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 28117588489 + 181493040400 = 167683^2 + 426020^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 209610628889 - 2⁴ = 209610628873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (209610628819) 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 7 ways as a sum of consecutive naturals, for example, 478334 + ... + 804999.

It is an arithmetic number, because the mean of its divisors is an integer number (26351338689).

Almost surely, 2^209610628889 is an apocalyptic number.

It is an amenable number.

209610628889 is a deficient number, since it is larger than the sum of its proper divisors (1200080623).

209610628889 is a wasteful number, since it uses less digits than its factorization.

209610628889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1284267.

The product of its (nonzero) digits is 5971968, while the sum is 59.

The spelling of 209610628889 in words is "two hundred nine billion, six hundred ten million, six hundred twenty-eight thousand, eight hundred eighty-nine".