209150388887 has 16 divisors (see below), whose sum is σ = 238472805888. Its totient is φ = 181573080480.

The previous prime is 209150388871. The next prime is 209150388899. The reversal of 209150388887 is 788883051902.

209150388887 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 209150388887 - 2⁴ = 209150388871 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 (209150388827) 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 15 ways as a sum of consecutive naturals, for example, 519203 + ... + 829380.

It is an arithmetic number, because the mean of its divisors is an integer number (14904550368).

Almost surely, 2^209150388887 is an apocalyptic number.

209150388887 is a deficient number, since it is larger than the sum of its proper divisors (29322417001).

209150388887 is a wasteful number, since it uses less digits than its factorization.

209150388887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1349230.

The product of its (nonzero) digits is 7741440, while the sum is 59.

The spelling of 209150388887 in words is "two hundred nine billion, one hundred fifty million, three hundred eighty-eight thousand, eight hundred eighty-seven".