19231919442 has 18 divisors (see below), whose sum is σ = 41670433623. Its totient is φ = 6410443692.

The previous prime is 19231919429. The next prime is 19231919461. The reversal of 19231919442 is 24491913291.

19231919442 is a `hidden beast` number, since 1 + 92 + 31 + 91 + 9 + 442 = 666.

It can be written as a sum of positive squares in only one way, i.e., 9615959721 + 9615959721 = 98061^2 + 98061^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=98061.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 572023 + ... + 604709.

Almost surely, 2^19231919442 is an apocalyptic number.

19231919442 is an abundant number, since it is smaller than the sum of its proper divisors (22438514181).

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

19231919442 is an frugal number, since it uses more digits than its factorization.

19231919442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65382 (or 32692 counting only the distinct ones).

The product of its digits is 139968, while the sum is 45.

The spelling of 19231919442 in words is "nineteen billion, two hundred thirty-one million, nine hundred nineteen thousand, four hundred forty-two".