19089681 has 8 divisors (see below), whose sum is σ = 27410880. Its totient is φ = 11747472.

The previous prime is 19089677. The next prime is 19089709. The reversal of 19089681 is 18698091.

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

It is not a de Polignac number, because 19089681 - 2² = 19089677 is a prime.

It is a super-2 number, since 2×19089681² = 728831841363522, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (19089601) 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, 244701 + ... + 244778.

It is an arithmetic number, because the mean of its divisors is an integer number (3426360).

Almost surely, 2^19089681 is an apocalyptic number.

It is an amenable number.

19089681 is a deficient number, since it is larger than the sum of its proper divisors (8321199).

19089681 is a wasteful number, since it uses less digits than its factorization.

19089681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 489495.

The product of its (nonzero) digits is 31104, while the sum is 42.

The square root of 19089681 is about 4369.1739493868. The cubic root of 19089681 is about 267.2593392614.

The spelling of 19089681 in words is "nineteen million, eighty-nine thousand, six hundred eighty-one".