612230821 has 2 divisors, whose sum is σ = 612230822. Its totient is φ = 612230820.

The previous prime is 612230783. The next prime is 612230849. The reversal of 612230821 is 128032216.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 381616225 + 230614596 = 19535^2 + 15186^2 .

It is a cyclic number.

It is not a de Polignac number, because 612230821 - 2⁹ = 612230309 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (612210821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 306115410 + 306115411.

It is an arithmetic number, because the mean of its divisors is an integer number (306115411).

Almost surely, 2^612230821 is an apocalyptic number.

It is an amenable number.

612230821 is a deficient number, since it is larger than the sum of its proper divisors (1).

612230821 is an equidigital number, since it uses as much as digits as its factorization.

612230821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 612230821 is about 24743.2985068685. The cubic root of 612230821 is about 849.1251996385.

The spelling of 612230821 in words is "six hundred twelve million, two hundred thirty thousand, eight hundred twenty-one".