823719961 has 2 divisors, whose sum is σ = 823719962. Its totient is φ = 823719960.

The previous prime is 823719931. The next prime is 823719991. The reversal of 823719961 is 169917328.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (823719931) and next prime (823719991).

It can be written as a sum of positive squares in only one way, i.e., 586559961 + 237160000 = 24219^2 + 15400^2 .

It is a cyclic number.

It is not a de Polignac number, because 823719961 - 2⁷ = 823719833 is a prime.

It is not a weakly prime, because it can be changed into another prime (823719931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 411859980 + 411859981.

It is an arithmetic number, because the mean of its divisors is an integer number (411859981).

Almost surely, 2^823719961 is an apocalyptic number.

It is an amenable number.

823719961 is a deficient number, since it is larger than the sum of its proper divisors (1).

823719961 is an equidigital number, since it uses as much as digits as its factorization.

823719961 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 163296, while the sum is 46.

The square root of 823719961 is about 28700.5219638947. The cubic root of 823719961 is about 937.4034122951.

The spelling of 823719961 in words is "eight hundred twenty-three million, seven hundred nineteen thousand, nine hundred sixty-one".