19122191 has 4 divisors (see below), whose sum is σ = 20860584. Its totient is φ = 17383800.

The previous prime is 19122167. The next prime is 19122193.

19122191 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19122191 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 19122191.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19122193) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 869180 + ... + 869201.

It is an arithmetic number, because the mean of its divisors is an integer number (5215146).

Almost surely, 2^19122191 is an apocalyptic number.

19122191 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

19122191 is a deficient number, since it is larger than the sum of its proper divisors (1738393).

19122191 is a wasteful number, since it uses less digits than its factorization.

19122191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1738392.

The product of its digits is 324, while the sum is 26.

The square root of 19122191 is about 4372.8927496567. The cubic root of 19122191 is about 267.4109687117.

The spelling of 19122191 in words is "nineteen million, one hundred twenty-two thousand, one hundred ninety-one".