191012794985 has 8 divisors (see below), whose sum is σ = 229716922056. Its totient is φ = 152475857280.

The previous prime is 191012794969. The next prime is 191012794991. The reversal of 191012794985 is 589497210191.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 115227660304 + 75785134681 = 339452^2 + 275291^2 .

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

It is not a de Polignac number, because 191012794985 - 2⁴ = 191012794969 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 191012794985.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41794826 + ... + 41799395.

It is an arithmetic number, because the mean of its divisors is an integer number (28714615257).

Almost surely, 2^191012794985 is an apocalyptic number.

It is an amenable number.

191012794985 is a deficient number, since it is larger than the sum of its proper divisors (38704127071).

191012794985 is an equidigital number, since it uses as much as digits as its factorization.

191012794985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83594683.

The product of its (nonzero) digits is 1632960, while the sum is 56.

The spelling of 191012794985 in words is "one hundred ninety-one billion, twelve million, seven hundred ninety-four thousand, nine hundred eighty-five".