621433717 has 2 divisors, whose sum is σ = 621433718. Its totient is φ = 621433716.

The previous prime is 621433693. The next prime is 621433723. The reversal of 621433717 is 717334126.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 558802321 + 62631396 = 23639^2 + 7914^2 .

It is a cyclic number.

It is not a de Polignac number, because 621433717 - 2¹¹ = 621431669 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (621433727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310716858 + 310716859.

It is an arithmetic number, because the mean of its divisors is an integer number (310716859).

Almost surely, 2^621433717 is an apocalyptic number.

It is an amenable number.

621433717 is a deficient number, since it is larger than the sum of its proper divisors (1).

621433717 is an equidigital number, since it uses as much as digits as its factorization.

621433717 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21168, while the sum is 34.

The square root of 621433717 is about 24928.5723016782. The cubic root of 621433717 is about 853.3586682576.

The spelling of 621433717 in words is "six hundred twenty-one million, four hundred thirty-three thousand, seven hundred seventeen".