621520063 has 2 divisors, whose sum is σ = 621520064. Its totient is φ = 621520062.

The previous prime is 621520021. The next prime is 621520103. The reversal of 621520063 is 360025126.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 621520063 - 2⁹ = 621519551 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (621520363) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310760031 + 310760032.

It is an arithmetic number, because the mean of its divisors is an integer number (310760032).

Almost surely, 2^621520063 is an apocalyptic number.

621520063 is a deficient number, since it is larger than the sum of its proper divisors (1).

621520063 is an equidigital number, since it uses as much as digits as its factorization.

621520063 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 621520063 is about 24930.3041096574. The cubic root of 621520063 is about 853.3981901422.

Adding to 621520063 its reverse (360025126), we get a palindrome (981545189).

The spelling of 621520063 in words is "six hundred twenty-one million, five hundred twenty thousand, sixty-three".