821191241 has 8 divisors (see below), whose sum is σ = 922810560. Its totient is φ = 725064912.

The previous prime is 821191223. The next prime is 821191243. The reversal of 821191241 is 142191128.

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

It is not a de Polignac number, because 821191241 - 2¹⁴ = 821174857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (821191243) 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 7 ways as a sum of consecutive naturals, for example, 1372931 + ... + 1373528.

It is an arithmetic number, because the mean of its divisors is an integer number (115351320).

Almost surely, 2^821191241 is an apocalyptic number.

It is an amenable number.

821191241 is a deficient number, since it is larger than the sum of its proper divisors (101619319).

821191241 is a wasteful number, since it uses less digits than its factorization.

821191241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2746495.

The product of its digits is 1152, while the sum is 29.

The square root of 821191241 is about 28656.4345479336. The cubic root of 821191241 is about 936.4431909177.

The spelling of 821191241 in words is "eight hundred twenty-one million, one hundred ninety-one thousand, two hundred forty-one".