191656641 has 8 divisors (see below), whose sum is σ = 278773344. Its totient is φ = 116155520.

The previous prime is 191656627. The next prime is 191656687. The reversal of 191656641 is 146656191.

191656641 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 191656641 - 2¹⁰ = 191655617 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 191656641.

It is not an unprimeable number, because it can be changed into a prime (191656441) 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, 2903856 + ... + 2903921.

It is an arithmetic number, because the mean of its divisors is an integer number (34846668).

Almost surely, 2^191656641 is an apocalyptic number.

191656641 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

191656641 is a deficient number, since it is larger than the sum of its proper divisors (87116703).

191656641 is a wasteful number, since it uses less digits than its factorization.

191656641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5807791.

The product of its digits is 38880, while the sum is 39.

The square root of 191656641 is about 13844.0110155980. The cubic root of 191656641 is about 576.5557275238. Note that the first 3 decimals are identical.

The spelling of 191656641 in words is "one hundred ninety-one million, six hundred fifty-six thousand, six hundred forty-one".