891611243 has 4 divisors (see below), whose sum is σ = 920372928. Its totient is φ = 862849560.

The previous prime is 891611239. The next prime is 891611251. The reversal of 891611243 is 342116198.

891611243 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 891611243 - 2² = 891611239 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (891611213) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14380796 + ... + 14380857.

It is an arithmetic number, because the mean of its divisors is an integer number (230093232).

Almost surely, 2^891611243 is an apocalyptic number.

891611243 is a deficient number, since it is larger than the sum of its proper divisors (28761685).

891611243 is a wasteful number, since it uses less digits than its factorization.

891611243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28761684.

The product of its digits is 10368, while the sum is 35.

The square root of 891611243 is about 29859.8600633024. The cubic root of 891611243 is about 962.4802916749.

The spelling of 891611243 in words is "eight hundred ninety-one million, six hundred eleven thousand, two hundred forty-three".