19234570081 has 4 divisors (see below), whose sum is σ = 19549890964. Its totient is φ = 18919249200.

The previous prime is 19234570063. The next prime is 19234570123. The reversal of 19234570081 is 18007543291.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18007543291 = 1613 ⋅11164007.

It can be written as a sum of positive squares in 2 ways, for example, as 378886225 + 18855683856 = 19465^2 + 137316^2 .

It is a cyclic number.

It is not a de Polignac number, because 19234570081 - 2¹¹ = 19234568033 is a prime.

It is a super-2 number, since 2×19234570081² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19234570001) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 157660350 + ... + 157660471.

It is an arithmetic number, because the mean of its divisors is an integer number (4887472741).

Almost surely, 2^19234570081 is an apocalyptic number.

It is an amenable number.

19234570081 is a deficient number, since it is larger than the sum of its proper divisors (315320883).

19234570081 is an equidigital number, since it uses as much as digits as its factorization.

19234570081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 315320882.

The product of its (nonzero) digits is 60480, while the sum is 40.

The spelling of 19234570081 in words is "nineteen billion, two hundred thirty-four million, five hundred seventy thousand, eighty-one".