621145589 has 2 divisors, whose sum is σ = 621145590. Its totient is φ = 621145588.

The previous prime is 621145583. The next prime is 621145607. The reversal of 621145589 is 985541126.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 531994225 + 89151364 = 23065^2 + 9442^2 .

It is a cyclic number.

It is not a de Polignac number, because 621145589 - 2²⁰ = 620097013 is a prime.

It is a super-3 number, since 3×621145589³ (a number of 27 digits) contains 333 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (621145583) 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, 310572794 + 310572795.

It is an arithmetic number, because the mean of its divisors is an integer number (310572795).

Almost surely, 2^621145589 is an apocalyptic number.

It is an amenable number.

621145589 is a deficient number, since it is larger than the sum of its proper divisors (1).

621145589 is an equidigital number, since it uses as much as digits as its factorization.

621145589 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 86400, while the sum is 41.

The square root of 621145589 is about 24922.7925602249. The cubic root of 621145589 is about 853.2267611693.

The spelling of 621145589 in words is "six hundred twenty-one million, one hundred forty-five thousand, five hundred eighty-nine".