19012521089 has 8 divisors (see below), whose sum is σ = 19451639592. Its totient is φ = 18576380160.

The previous prime is 19012521071. The next prime is 19012521103. The reversal of 19012521089 is 98012521091.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 9758081089 + 9254440000 = 98783^2 + 96200^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 19012521089 - 2¹² = 19012516993 is a prime.

It is a super-2 number, since 2×19012521089² (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 (19012521389) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 731474 + ... + 757019.

It is an arithmetic number, because the mean of its divisors is an integer number (2431454949).

Almost surely, 2^19012521089 is an apocalyptic number.

It is an amenable number.

19012521089 is a deficient number, since it is larger than the sum of its proper divisors (439118503).

19012521089 is a wasteful number, since it uses less digits than its factorization.

19012521089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1488787.

The product of its (nonzero) digits is 12960, while the sum is 38.

The spelling of 19012521089 in words is "nineteen billion, twelve million, five hundred twenty-one thousand, eighty-nine".