612208621 has 2 divisors, whose sum is σ = 612208622. Its totient is φ = 612208620.

The previous prime is 612208579. The next prime is 612208651. The reversal of 612208621 is 126802216.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 428904100 + 183304521 = 20710^2 + 13539^2 .

It is a cyclic number.

It is not a de Polignac number, because 612208621 - 2⁹ = 612208109 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 612208621.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (612208651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 306104310 + 306104311.

It is an arithmetic number, because the mean of its divisors is an integer number (306104311).

Almost surely, 2^612208621 is an apocalyptic number.

It is an amenable number.

612208621 is a deficient number, since it is larger than the sum of its proper divisors (1).

612208621 is an equidigital number, since it uses as much as digits as its factorization.

612208621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 612208621 is about 24742.8498964852. The cubic root of 612208621 is about 849.1149361852.

The spelling of 612208621 in words is "six hundred twelve million, two hundred eight thousand, six hundred twenty-one".