191013685 has 4 divisors (see below), whose sum is σ = 229216428. Its totient is φ = 152810944.

The previous prime is 191013653. The next prime is 191013703. The reversal of 191013685 is 586310191.

191013685 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 586310191 = 971 ⋅603821.

It can be written as a sum of positive squares in 2 ways, for example, as 32706961 + 158306724 = 5719^2 + 12582^2 .

It is a cyclic number.

It is not a de Polignac number, because 191013685 - 2⁵ = 191013653 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 191013685.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19101364 + ... + 19101373.

It is an arithmetic number, because the mean of its divisors is an integer number (57304107).

Almost surely, 2^191013685 is an apocalyptic number.

It is an amenable number.

191013685 is a deficient number, since it is larger than the sum of its proper divisors (38202743).

191013685 is an equidigital number, since it uses as much as digits as its factorization.

191013685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38202742.

The product of its (nonzero) digits is 6480, while the sum is 34.

The square root of 191013685 is about 13820.7700581408. The cubic root of 191013685 is about 575.9102758986.

The spelling of 191013685 in words is "one hundred ninety-one million, thirteen thousand, six hundred eighty-five".