821537606 has 8 divisors (see below), whose sum is σ = 1235798424. Its totient is φ = 409604800.

The previous prime is 821537593. The next prime is 821537609. The reversal of 821537606 is 606735128.

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

It is a super-2 number, since 2×821537606² = 1349848076144422472, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 821537606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (821537609) 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, 581120 + ... + 582531.

It is an arithmetic number, because the mean of its divisors is an integer number (154474803).

Almost surely, 2^821537606 is an apocalyptic number.

821537606 is a deficient number, since it is larger than the sum of its proper divisors (414260818).

821537606 is a wasteful number, since it uses less digits than its factorization.

821537606 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1164006.

The product of its (nonzero) digits is 60480, while the sum is 38.

The square root of 821537606 is about 28662.4773179151. The cubic root of 821537606 is about 936.5748312057.

The spelling of 821537606 in words is "eight hundred twenty-one million, five hundred thirty-seven thousand, six hundred six".