12191491378 has 8 divisors (see below), whose sum is σ = 19949713200. Its totient is φ = 5541586980.

The previous prime is 12191491339. The next prime is 12191491391. The reversal of 12191491378 is 87319419121.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 277079328 + ... + 277079371.

It is an arithmetic number, because the mean of its divisors is an integer number (2493714150).

Almost surely, 2^12191491378 is an apocalyptic number.

12191491378 is a deficient number, since it is larger than the sum of its proper divisors (7758221822).

12191491378 is a wasteful number, since it uses less digits than its factorization.

12191491378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 554158712.

The product of its digits is 108864, while the sum is 46.

The spelling of 12191491378 in words is "twelve billion, one hundred ninety-one million, four hundred ninety-one thousand, three hundred seventy-eight".