823465421 has 2 divisors, whose sum is σ = 823465422. Its totient is φ = 823465420.

The previous prime is 823465393. The next prime is 823465457. The reversal of 823465421 is 124564328.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 724363396 + 99102025 = 26914^2 + 9955^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-823465421 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (823465921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 411732710 + 411732711.

It is an arithmetic number, because the mean of its divisors is an integer number (411732711).

Almost surely, 2^823465421 is an apocalyptic number.

It is an amenable number.

823465421 is a deficient number, since it is larger than the sum of its proper divisors (1).

823465421 is an equidigital number, since it uses as much as digits as its factorization.

823465421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 46080, while the sum is 35.

The square root of 823465421 is about 28696.0872071438. The cubic root of 823465421 is about 937.3068458010.

The spelling of 823465421 in words is "eight hundred twenty-three million, four hundred sixty-five thousand, four hundred twenty-one".