821495 has 4 divisors (see below), whose sum is σ = 985800. Its totient is φ = 657192.

The previous prime is 821489. The next prime is 821497. The reversal of 821495 is 594128.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 821495 - 2⁴ = 821479 is a prime.

It is a plaindrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (821497) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 82145 + ... + 82154.

It is an arithmetic number, because the mean of its divisors is an integer number (246450).

2⁸²¹⁴⁹⁵ is an apocalyptic number.

821495 is a deficient number, since it is larger than the sum of its proper divisors (164305).

821495 is a wasteful number, since it uses less digits than its factorization.

821495 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164304.

The product of its digits is 2880, while the sum is 29.

The square root of 821495 is about 906.3636135680. The cubic root of 821495 is about 93.6558640266.

The spelling of 821495 in words is "eight hundred twenty-one thousand, four hundred ninety-five".