823964069 has 2 divisors, whose sum is σ = 823964070. Its totient is φ = 823964068.

The previous prime is 823964039. The next prime is 823964081. The reversal of 823964069 is 960469328.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 822943969 + 1020100 = 28687^2 + 1010^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-823964069 is a prime.

It is a super-2 number, since 2×823964069² = 1357833574006073522, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (823964039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 411982034 + 411982035.

It is an arithmetic number, because the mean of its divisors is an integer number (411982035).

Almost surely, 2^823964069 is an apocalyptic number.

It is an amenable number.

823964069 is a deficient number, since it is larger than the sum of its proper divisors (1).

823964069 is an equidigital number, since it uses as much as digits as its factorization.

823964069 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 559872, while the sum is 47.

The square root of 823964069 is about 28704.7743241434. The cubic root of 823964069 is about 937.4960024481.

The spelling of 823964069 in words is "eight hundred twenty-three million, nine hundred sixty-four thousand, sixty-nine".