412530821 has 2 divisors, whose sum is σ = 412530822. Its totient is φ = 412530820.

The previous prime is 412530817. The next prime is 412530827. The reversal of 412530821 is 128035214.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 392594596 + 19936225 = 19814^2 + 4465^2 .

It is a cyclic number.

It is not a de Polignac number, because 412530821 - 2² = 412530817 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (412530827) 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, 206265410 + 206265411.

It is an arithmetic number, because the mean of its divisors is an integer number (206265411).

Almost surely, 2^412530821 is an apocalyptic number.

It is an amenable number.

412530821 is a deficient number, since it is larger than the sum of its proper divisors (1).

412530821 is an equidigital number, since it uses as much as digits as its factorization.

412530821 is an odious number, because the sum of its binary digits is odd.

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

The square root of 412530821 is about 20310.8547579859. The cubic root of 412530821 is about 744.4213160055.

The spelling of 412530821 in words is "four hundred twelve million, five hundred thirty thousand, eight hundred twenty-one".