191564 has 12 divisors (see below), whose sum is σ = 339864. Its totient is φ = 94464.

The previous prime is 191563. The next prime is 191579. The reversal of 191564 is 465191.

191564 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (191561) 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, 44 + ... + 620.

It is an arithmetic number, because the mean of its divisors is an integer number (28322).

2¹⁹¹⁵⁶⁴ is an apocalyptic number.

It is an amenable number.

191564 is a deficient number, since it is larger than the sum of its proper divisors (148300).

191564 is a wasteful number, since it uses less digits than its factorization.

191564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 664 (or 662 counting only the distinct ones).

The product of its digits is 1080, while the sum is 26.

The square root of 191564 is about 437.6802485834. The cubic root of 191564 is about 57.6462816042.

The spelling of 191564 in words is "one hundred ninety-one thousand, five hundred sixty-four".