189212590817 has 4 divisors (see below), whose sum is σ = 200342743236. Its totient is φ = 178082438400.

The previous prime is 189212590789. The next prime is 189212590837. The reversal of 189212590817 is 718095212981.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 718095212981 = 124759 ⋅5755859.

It can be written as a sum of positive squares in 2 ways, for example, as 59609710801 + 129602880016 = 244151^2 + 360004^2 .

It is a cyclic number.

It is not a de Polignac number, because 189212590817 - 2⁸ = 189212590561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (189212590837) 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, 5565076184 + ... + 5565076217.

It is an arithmetic number, because the mean of its divisors is an integer number (50085685809).

Almost surely, 2^189212590817 is an apocalyptic number.

189212590817 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

189212590817 is a deficient number, since it is larger than the sum of its proper divisors (11130152419).

189212590817 is a wasteful number, since it uses less digits than its factorization.

189212590817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11130152418.

The product of its (nonzero) digits is 725760, while the sum is 53.

The spelling of 189212590817 in words is "one hundred eighty-nine billion, two hundred twelve million, five hundred ninety thousand, eight hundred seventeen".