889657561 has 8 divisors (see below), whose sum is σ = 988999424. Its totient is φ = 794730960.

The previous prime is 889657543. The next prime is 889657567. The reversal of 889657561 is 165756988.

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 889657561 - 2¹⁷ = 889526489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (889657567) 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, 1103391 + ... + 1104196.

It is an arithmetic number, because the mean of its divisors is an integer number (123624928).

Almost surely, 2^889657561 is an apocalyptic number.

It is an amenable number.

889657561 is a deficient number, since it is larger than the sum of its proper divisors (99341863).

889657561 is a wasteful number, since it uses less digits than its factorization.

889657561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2207631.

The product of its digits is 3628800, while the sum is 55.

The square root of 889657561 is about 29827.1279375001. The cubic root of 889657561 is about 961.7767879418.

The spelling of 889657561 in words is "eight hundred eighty-nine million, six hundred fifty-seven thousand, five hundred sixty-one".