191686082869 has 4 divisors (see below), whose sum is σ = 191737353280. Its totient is φ = 191634812460.

The previous prime is 191686082867. The next prime is 191686082873. The reversal of 191686082869 is 968280686191.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 191686082869 - 2¹ = 191686082867 is a prime.

It is a super-2 number, since 2×191686082869² (a number of 23 digits) contains 22 as substring.

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 191686082869.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191686082867) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25629597 + ... + 25637074.

It is an arithmetic number, because the mean of its divisors is an integer number (47934338320).

Almost surely, 2^191686082869 is an apocalyptic number.

It is an amenable number.

191686082869 is a deficient number, since it is larger than the sum of its proper divisors (51270411).

191686082869 is an equidigital number, since it uses as much as digits as its factorization.

191686082869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51270410.

The product of its (nonzero) digits is 17915904, while the sum is 64.

The spelling of 191686082869 in words is "one hundred ninety-one billion, six hundred eighty-six million, eighty-two thousand, eight hundred sixty-nine".