621382717 has 2 divisors, whose sum is σ = 621382718. Its totient is φ = 621382716.

The previous prime is 621382639. The next prime is 621382721. The reversal of 621382717 is 717283126.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 529874361 + 91508356 = 23019^2 + 9566^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-621382717 is a prime.

It is a super-2 number, since 2×621382717² = 772232961972604178, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (621382777) 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, 310691358 + 310691359.

It is an arithmetic number, because the mean of its divisors is an integer number (310691359).

Almost surely, 2^621382717 is an apocalyptic number.

It is an amenable number.

621382717 is a deficient number, since it is larger than the sum of its proper divisors (1).

621382717 is an equidigital number, since it uses as much as digits as its factorization.

621382717 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 28224, while the sum is 37.

The square root of 621382717 is about 24927.5493580897. The cubic root of 621382717 is about 853.3353230578.

The spelling of 621382717 in words is "six hundred twenty-one million, three hundred eighty-two thousand, seven hundred seventeen".