191656 has 8 divisors (see below), whose sum is σ = 359370. Its totient is φ = 95824.

The previous prime is 191627. The next prime is 191657. The reversal of 191656 is 656191.

191656 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 136900 + 54756 = 370^2 + 234^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (191657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11971 + ... + 11986.

2¹⁹¹⁶⁵⁶ is an apocalyptic number.

It is an amenable number.

191656 is a deficient number, since it is larger than the sum of its proper divisors (167714).

191656 is a wasteful number, since it uses less digits than its factorization.

191656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23963 (or 23959 counting only the distinct ones).

The product of its digits is 1620, while the sum is 28.

The square root of 191656 is about 437.7853355242. The cubic root of 191656 is about 57.6555084755.

Subtracting from 191656 its product of digits (1620), we obtain a triangular number (190036 = T₆₁₆).

The spelling of 191656 in words is "one hundred ninety-one thousand, six hundred fifty-six".