191320563 has 16 divisors (see below), whose sum is σ = 294425856. Its totient is φ = 108242400.

The previous prime is 191320531. The next prime is 191320589. The reversal of 191320563 is 365023191.

It is not a de Polignac number, because 191320563 - 2⁵ = 191320531 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 191320563.

It is not an unprimeable number, because it can be changed into a prime (191320963) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42981 + ... + 47222.

It is an arithmetic number, because the mean of its divisors is an integer number (18401616).

Almost surely, 2^191320563 is an apocalyptic number.

191320563 is a deficient number, since it is larger than the sum of its proper divisors (103105293).

191320563 is a wasteful number, since it uses less digits than its factorization.

191320563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90314.

The product of its (nonzero) digits is 4860, while the sum is 30.

The square root of 191320563 is about 13831.8676613102. The cubic root of 191320563 is about 576.2185254225.

The spelling of 191320563 in words is "one hundred ninety-one million, three hundred twenty thousand, five hundred sixty-three".