820951 has 4 divisors (see below), whose sum is σ = 833272. Its totient is φ = 808632.

The previous prime is 820927. The next prime is 820957. The reversal of 820951 is 159028.

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 820951 - 2¹³ = 812759 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 (820957) 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, 6060 + ... + 6193.

It is an arithmetic number, because the mean of its divisors is an integer number (208318).

2⁸²⁰⁹⁵¹ is an apocalyptic number.

820951 is a deficient number, since it is larger than the sum of its proper divisors (12321).

820951 is a wasteful number, since it uses less digits than its factorization.

820951 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12320.

The product of its (nonzero) digits is 720, while the sum is 25.

The square root of 820951 is about 906.0634635609. The cubic root of 820951 is about 93.6351862621.

Adding to 820951 its reverse (159028), we get a palindrome (979979).

It can be divided in two parts, 820 and 951, that added together give a palindrome (1771).

The spelling of 820951 in words is "eight hundred twenty thousand, nine hundred fifty-one".