19195391897 has 8 divisors (see below), whose sum is σ = 20960402400. Its totient is φ = 17433710560.

The previous prime is 19195391881. The next prime is 19195391899. The reversal of 19195391897 is 79819359191.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 19195391897 - 2⁴ = 19195391881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19195391899) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 820223 + ... + 843300.

It is an arithmetic number, because the mean of its divisors is an integer number (2620050300).

Almost surely, 2^19195391897 is an apocalyptic number.

It is an amenable number.

19195391897 is a deficient number, since it is larger than the sum of its proper divisors (1765010503).

19195391897 is a wasteful number, since it uses less digits than its factorization.

19195391897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1664583.

The product of its digits is 5511240, while the sum is 62.

The spelling of 19195391897 in words is "nineteen billion, one hundred ninety-five million, three hundred ninety-one thousand, eight hundred ninety-seven".