19431104147991 has 48 divisors (see below), whose sum is σ = 28306252690560. Its totient is φ = 12844225105920.

The previous prime is 19431104147953. The next prime is 19431104148017. The reversal of 19431104147991 is 19974140113491.

19431104147991 is a `hidden beast` number, since 1 + 9 + 4 + 31 + 10 + 41 + 479 + 91 = 666.

It is not a de Polignac number, because 19431104147991 - 2²¹ = 19431102050839 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19431104147941) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1537629525 + ... + 1537642161.

It is an arithmetic number, because the mean of its divisors is an integer number (589713597720).

Almost surely, 2^{19431104147991} is an apocalyptic number.

19431104147991 is a deficient number, since it is larger than the sum of its proper divisors (8875148542569).

19431104147991 is a wasteful number, since it uses less digits than its factorization.

19431104147991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15896 (or 15893 counting only the distinct ones).

The product of its (nonzero) digits is 979776, while the sum is 54.

The spelling of 19431104147991 in words is "nineteen trillion, four hundred thirty-one billion, one hundred four million, one hundred forty-seven thousand, nine hundred ninety-one".