19749317841 has 12 divisors (see below), whose sum is σ = 31120137360. Its totient is φ = 11969283480.

The previous prime is 19749317827. The next prime is 19749317851. The reversal of 19749317841 is 14871394791.

It is a happy number.

It is not a de Polignac number, because 19749317841 - 2¹⁰ = 19749316817 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19749317851) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 99743931 + ... + 99744128.

It is an arithmetic number, because the mean of its divisors is an integer number (2593344780).

Almost surely, 2^19749317841 is an apocalyptic number.

19749317841 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

19749317841 is a deficient number, since it is larger than the sum of its proper divisors (11370819519).

19749317841 is a wasteful number, since it uses less digits than its factorization.

19749317841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199488076 (or 199488073 counting only the distinct ones).

The product of its digits is 1524096, while the sum is 54.

The spelling of 19749317841 in words is "nineteen billion, seven hundred forty-nine million, three hundred seventeen thousand, eight hundred forty-one".