621233609 has 2 divisors, whose sum is σ = 621233610. Its totient is φ = 621233608.

The previous prime is 621233593. The next prime is 621233629. The reversal of 621233609 is 906332126.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 340771600 + 280462009 = 18460^2 + 16747^2 .

It is a cyclic number.

It is not a de Polignac number, because 621233609 - 2⁴ = 621233593 is a prime.

It is a super-3 number, since 3×621233609³ (a number of 27 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (621233629) 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, 310616804 + 310616805.

It is an arithmetic number, because the mean of its divisors is an integer number (310616805).

Almost surely, 2^621233609 is an apocalyptic number.

It is an amenable number.

621233609 is a deficient number, since it is larger than the sum of its proper divisors (1).

621233609 is an equidigital number, since it uses as much as digits as its factorization.

621233609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11664, while the sum is 32.

The square root of 621233609 is about 24924.5583511524. The cubic root of 621233609 is about 853.2670616902.

The spelling of 621233609 in words is "six hundred twenty-one million, two hundred thirty-three thousand, six hundred nine".