18819175489 has 3 divisors (see below), whose sum is σ = 18819312673. Its totient is φ = 18819038306.

The previous prime is 18819175481. The next prime is 18819175517. The reversal of 18819175489 is 98457191881.

The square root of 18819175489 is 137183.

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, and also an emirpimes, since its reverse is a distinct semiprime: 98457191881 = 457 ⋅215442433.

It is not a de Polignac number, because 18819175489 - 2³ = 18819175481 is a prime.

It is a super-2 number, since 2×18819175489² (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 (18819175481) 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, 68592 + ... + 205774.

Almost surely, 2^18819175489 is an apocalyptic number.

18819175489 is the 137183-rd square number.

18819175489 is the 68592-nd centered octagonal number.

It is an amenable number.

18819175489 is a deficient number, since it is larger than the sum of its proper divisors (137184).

18819175489 is an frugal number, since it uses more digits than its factorization.

18819175489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 274366 (or 137183 counting only the distinct ones).

The product of its digits is 5806080, while the sum is 61.

The spelling of 18819175489 in words is "eighteen billion, eight hundred nineteen million, one hundred seventy-five thousand, four hundred eighty-nine".