19960191 has 6 divisors (see below), whose sum is σ = 28831400. Its totient is φ = 13306788.

The previous prime is 19960183. The next prime is 19960201. The reversal of 19960191 is 19106991.

It is not a de Polignac number, because 19960191 - 2³ = 19960183 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19960141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1108891 + ... + 1108908.

Almost surely, 2^19960191 is an apocalyptic number.

19960191 is a deficient number, since it is larger than the sum of its proper divisors (8871209).

19960191 is a wasteful number, since it uses less digits than its factorization.

19960191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2217805 (or 2217802 counting only the distinct ones).

The product of its (nonzero) digits is 4374, while the sum is 36.

The square root of 19960191 is about 4467.6829565223. The cubic root of 19960191 is about 271.2615449509.

The spelling of 19960191 in words is "nineteen million, nine hundred sixty thousand, one hundred ninety-one".