191205655 has 8 divisors (see below), whose sum is σ = 230774112. Its totient is φ = 152079648.

The previous prime is 191205653. The next prime is 191205697. The reversal of 191205655 is 556502191.

191205655 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 191205655 - 2¹ = 191205653 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 191205655.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191205653) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 109659 + ... + 111388.

It is an arithmetic number, because the mean of its divisors is an integer number (28846764).

Almost surely, 2^191205655 is an apocalyptic number.

191205655 is a deficient number, since it is larger than the sum of its proper divisors (39568457).

191205655 is a wasteful number, since it uses less digits than its factorization.

191205655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221225.

The product of its (nonzero) digits is 13500, while the sum is 34.

The square root of 191205655 is about 13827.7132961311. The cubic root of 191205655 is about 576.1031424975.

The spelling of 191205655 in words is "one hundred ninety-one million, two hundred five thousand, six hundred fifty-five".