209164391834 has 8 divisors (see below), whose sum is σ = 317271830580. Its totient is φ = 103407114976.

The previous prime is 209164391789. The next prime is 209164391879. The reversal of 209164391834 is 438193461902.

209164391834 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (209164391789) and next prime (209164391879).

It can be written as a sum of positive squares in 2 ways, for example, as 203809811209 + 5354580625 = 451453^2 + 73175^2 .

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

It is a super-2 number, since 2×209164391834² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 587540249 + ... + 587540604.

Almost surely, 2^209164391834 is an apocalyptic number.

209164391834 is a deficient number, since it is larger than the sum of its proper divisors (108107438746).

209164391834 is a wasteful number, since it uses less digits than its factorization.

209164391834 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1175080944.

The product of its (nonzero) digits is 1119744, while the sum is 50.

The spelling of 209164391834 in words is "two hundred nine billion, one hundred sixty-four million, three hundred ninety-one thousand, eight hundred thirty-four".