412305821 has 2 divisors, whose sum is σ = 412305822. Its totient is φ = 412305820.

The previous prime is 412305809. The next prime is 412305827. The reversal of 412305821 is 128503214.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 356265625 + 56040196 = 18875^2 + 7486^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-412305821 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 (412305827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 206152910 + 206152911.

It is an arithmetic number, because the mean of its divisors is an integer number (206152911).

Almost surely, 2^412305821 is an apocalyptic number.

It is an amenable number.

412305821 is a deficient number, since it is larger than the sum of its proper divisors (1).

412305821 is an equidigital number, since it uses as much as digits as its factorization.

412305821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 412305821 is about 20305.3150923594. The cubic root of 412305821 is about 744.2859521747.

The spelling of 412305821 in words is "four hundred twelve million, three hundred five thousand, eight hundred twenty-one".