19145007191 has 4 divisors (see below), whose sum is σ = 19977398832. Its totient is φ = 18312615552.

The previous prime is 19145007163. The next prime is 19145007223. The reversal of 19145007191 is 19170054191.

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-19145007191 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 (19145007121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 416195786 + ... + 416195831.

It is an arithmetic number, because the mean of its divisors is an integer number (4994349708).

Almost surely, 2^19145007191 is an apocalyptic number.

19145007191 is a deficient number, since it is larger than the sum of its proper divisors (832391641).

19145007191 is an equidigital number, since it uses as much as digits as its factorization.

19145007191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 832391640.

The product of its (nonzero) digits is 11340, while the sum is 38.

The spelling of 19145007191 in words is "nineteen billion, one hundred forty-five million, seven thousand, one hundred ninety-one".