19025512489 has 3 divisors (see below), whose sum is σ = 19025650423. Its totient is φ = 19025374556.

The previous prime is 19025512433. The next prime is 19025512501. The reversal of 19025512489 is 98421552091.

It is a happy number.

The square root of 19025512489 is 137933.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 15414464025 + 3611048464 = 124155^2 + 60092^2 .

It is not a de Polignac number, because 19025512489 - 2²¹ = 19023415337 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19025513489) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 68967 + ... + 206899.

Almost surely, 2^19025512489 is an apocalyptic number.

19025512489 is the 137933-rd square number.

19025512489 is the 68967-th centered octagonal number.

It is an amenable number.

19025512489 is a deficient number, since it is larger than the sum of its proper divisors (137934).

19025512489 is an frugal number, since it uses more digits than its factorization.

19025512489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 275866 (or 137933 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 46.

The spelling of 19025512489 in words is "nineteen billion, twenty-five million, five hundred twelve thousand, four hundred eighty-nine".