969821 has 2 divisors, whose sum is σ = 969822. Its totient is φ = 969820.

The previous prime is 969809. The next prime is 969851. The reversal of 969821 is 128969.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 532900 + 436921 = 730^2 + 661^2 .

It is an emirp because it is prime and its reverse (128969) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 969821 - 2⁶ = 969757 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (969851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 484910 + 484911.

It is an arithmetic number, because the mean of its divisors is an integer number (484911).

2⁹⁶⁹⁸²¹ is an apocalyptic number.

It is an amenable number.

969821 is a deficient number, since it is larger than the sum of its proper divisors (1).

969821 is an equidigital number, since it uses as much as digits as its factorization.

969821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7776, while the sum is 35.

The square root of 969821 is about 984.7949025051. The cubic root of 969821 is about 98.9837404852.

The spelling of 969821 in words is "nine hundred sixty-nine thousand, eight hundred twenty-one".