823421653 has 2 divisors, whose sum is σ = 823421654. Its totient is φ = 823421652.

The previous prime is 823421629. The next prime is 823421701. The reversal of 823421653 is 356124328.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 726733764 + 96687889 = 26958^2 + 9833^2 .

It is a cyclic number.

It is not a de Polignac number, because 823421653 - 2²¹ = 821324501 is a prime.

It is equal to p_42288145 and since 823421653 and 42288145 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (823421453) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 411710826 + 411710827.

It is an arithmetic number, because the mean of its divisors is an integer number (411710827).

Almost surely, 2^823421653 is an apocalyptic number.

It is an amenable number.

823421653 is a deficient number, since it is larger than the sum of its proper divisors (1).

823421653 is an equidigital number, since it uses as much as digits as its factorization.

823421653 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34560, while the sum is 34.

The square root of 823421653 is about 28695.3245843291. The cubic root of 823421653 is about 937.2902392454.

The spelling of 823421653 in words is "eight hundred twenty-three million, four hundred twenty-one thousand, six hundred fifty-three".