821287601 has 8 divisors (see below), whose sum is σ = 839222208. Its totient is φ = 803530000.

The previous prime is 821287583. The next prime is 821287609. The reversal of 821287601 is 106782128.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-821287601 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (821287609) 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 7 ways as a sum of consecutive naturals, for example, 34850 + ... + 53451.

It is an arithmetic number, because the mean of its divisors is an integer number (104902776).

Almost surely, 2^821287601 is an apocalyptic number.

It is an amenable number.

821287601 is a deficient number, since it is larger than the sum of its proper divisors (17934607).

821287601 is a wasteful number, since it uses less digits than its factorization.

821287601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88503.

The product of its (nonzero) digits is 10752, while the sum is 35.

The square root of 821287601 is about 28658.1157964022. The cubic root of 821287601 is about 936.4798174395.

The spelling of 821287601 in words is "eight hundred twenty-one million, two hundred eighty-seven thousand, six hundred one".