821662349 has 4 divisors (see below), whose sum is σ = 821759136. Its totient is φ = 821565564.

The previous prime is 821662337. The next prime is 821662363. The reversal of 821662349 is 943266128.

821662349 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, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 821662349 - 2⁴ = 821662333 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 (821662399) 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, 34289 + ... + 53094.

It is an arithmetic number, because the mean of its divisors is an integer number (205439784).

Almost surely, 2^821662349 is an apocalyptic number.

It is an amenable number.

821662349 is a deficient number, since it is larger than the sum of its proper divisors (96787).

821662349 is an equidigital number, since it uses as much as digits as its factorization.

821662349 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96786.

The product of its digits is 124416, while the sum is 41.

The square root of 821662349 is about 28664.6533033281. The cubic root of 821662349 is about 936.6222322582.

The spelling of 821662349 in words is "eight hundred twenty-one million, six hundred sixty-two thousand, three hundred forty-nine".