19320191 has 6 divisors (see below), whose sum is σ = 21236376. Its totient is φ = 17563700.

The previous prime is 19320173. The next prime is 19320193. The reversal of 19320191 is 19102391.

It is not a de Polignac number, because 19320191 - 2¹⁴ = 19303807 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 19320191.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19320193) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 79715 + ... + 79956.

It is an arithmetic number, because the mean of its divisors is an integer number (3539396).

Almost surely, 2^19320191 is an apocalyptic number.

19320191 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

19320191 is a deficient number, since it is larger than the sum of its proper divisors (1916185).

19320191 is a wasteful number, since it uses less digits than its factorization.

19320191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159693 (or 159682 counting only the distinct ones).

The product of its (nonzero) digits is 486, while the sum is 26.

The square root of 19320191 is about 4395.4739221158. The cubic root of 19320191 is about 268.3307668783.

The spelling of 19320191 in words is "nineteen million, three hundred twenty thousand, one hundred ninety-one".