621342089 has 2 divisors, whose sum is σ = 621342090. Its totient is φ = 621342088.

The previous prime is 621342013. The next prime is 621342143. The reversal of 621342089 is 980243126.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 605406025 + 15936064 = 24605^2 + 3992^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-621342089 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (621342289) 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, 310671044 + 310671045.

It is an arithmetic number, because the mean of its divisors is an integer number (310671045).

Almost surely, 2^621342089 is an apocalyptic number.

It is an amenable number.

621342089 is a deficient number, since it is larger than the sum of its proper divisors (1).

621342089 is an equidigital number, since it uses as much as digits as its factorization.

621342089 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20736, while the sum is 35.

The square root of 621342089 is about 24926.7344231048. The cubic root of 621342089 is about 853.3167247168.

The spelling of 621342089 in words is "six hundred twenty-one million, three hundred forty-two thousand, eighty-nine".