891689223 has 4 divisors (see below), whose sum is σ = 1188918968. Its totient is φ = 594459480.

The previous prime is 891689221. The next prime is 891689251. The reversal of 891689223 is 322986198.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 891689223 - 2¹ = 891689221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (891689221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 148614868 + ... + 148614873.

It is an arithmetic number, because the mean of its divisors is an integer number (297229742).

Almost surely, 2^891689223 is an apocalyptic number.

891689223 is a deficient number, since it is larger than the sum of its proper divisors (297229745).

891689223 is a wasteful number, since it uses less digits than its factorization.

891689223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 297229744.

The product of its digits is 373248, while the sum is 48.

The square root of 891689223 is about 29861.1658010869. The cubic root of 891689223 is about 962.5083502508.

The spelling of 891689223 in words is "eight hundred ninety-one million, six hundred eighty-nine thousand, two hundred twenty-three".