891545243 has 4 divisors (see below), whose sum is σ = 891687888. Its totient is φ = 891402600.

The previous prime is 891545233. The next prime is 891545269. The reversal of 891545243 is 342545198.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 342545198 = 2 ⋅171272599.

It is a cyclic number.

It is not a de Polignac number, because 891545243 - 2⁸ = 891544987 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 891545243.

It is not an unprimeable number, because it can be changed into a prime (891545233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61496 + ... + 74597.

It is an arithmetic number, because the mean of its divisors is an integer number (222921972).

Almost surely, 2^891545243 is an apocalyptic number.

891545243 is a deficient number, since it is larger than the sum of its proper divisors (142645).

891545243 is a wasteful number, since it uses less digits than its factorization.

891545243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142644.

The product of its digits is 172800, while the sum is 41.

The square root of 891545243 is about 29858.7548802692. The cubic root of 891545243 is about 962.4565424355.

The spelling of 891545243 in words is "eight hundred ninety-one million, five hundred forty-five thousand, two hundred forty-three".