19431523608 has 64 divisors (see below), whose sum is σ = 55536960000. Its totient is φ = 5550031872.

The previous prime is 19431523603. The next prime is 19431523673. The reversal of 19431523608 is 80632513491.

It is a Cunningham number, because it is equal to 139397²-1.

It is a super-2 number, since 2×19431523608² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a self number, because there is not a number n which added to its sum of digits gives 19431523608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19431523603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 540168 + ... + 575016.

It is an arithmetic number, because the mean of its divisors is an integer number (867765000).

Almost surely, 2^19431523608 is an apocalyptic number.

It is an amenable number.

19431523608 is an abundant number, since it is smaller than the sum of its proper divisors (36105436392).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19431523608 is a wasteful number, since it uses less digits than its factorization.

19431523608 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38184 (or 38180 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 42.

The spelling of 19431523608 in words is "nineteen billion, four hundred thirty-one million, five hundred twenty-three thousand, six hundred eight".