19139191 has 4 divisors (see below), whose sum is σ = 19207584. Its totient is φ = 19070800.

The previous prime is 19139179. The next prime is 19139203. The reversal of 19139191 is 19193191.

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

It is an interprime number because it is at equal distance from previous prime (19139179) and next prime (19139203).

It is a cyclic number.

It is not a de Polignac number, because 19139191 - 2⁷ = 19139063 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 (19139111) 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, 33775 + ... + 34336.

It is an arithmetic number, because the mean of its divisors is an integer number (4801896).

Almost surely, 2^19139191 is an apocalyptic number.

19139191 is a deficient number, since it is larger than the sum of its proper divisors (68393).

19139191 is an equidigital number, since it uses as much as digits as its factorization.

19139191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68392.

The product of its digits is 2187, while the sum is 34.

The square root of 19139191 is about 4374.8361112161. The cubic root of 19139191 is about 267.4901897587.

The spelling of 19139191 in words is "nineteen million, one hundred thirty-nine thousand, one hundred ninety-one".