889521217 has 8 divisors (see below), whose sum is σ = 960227240. Its totient is φ = 819141120.

The previous prime is 889521173. The next prime is 889521239. The reversal of 889521217 is 712125988.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 18326961 + 871194256 = 4281^2 + 29516^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-889521217 is a prime.

It is a super-2 number, since 2×889521217² = 1582495990986322178, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (889521257) 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, 75792 + ... + 86737.

It is an arithmetic number, because the mean of its divisors is an integer number (120028405).

Almost surely, 2^889521217 is an apocalyptic number.

It is an amenable number.

889521217 is a deficient number, since it is larger than the sum of its proper divisors (70706023).

889521217 is a wasteful number, since it uses less digits than its factorization.

889521217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162963.

The product of its digits is 80640, while the sum is 43.

The square root of 889521217 is about 29824.8422795494. The cubic root of 889521217 is about 961.7276532337.

The spelling of 889521217 in words is "eight hundred eighty-nine million, five hundred twenty-one thousand, two hundred seventeen".