621503713 has 2 divisors, whose sum is σ = 621503714. Its totient is φ = 621503712.

The previous prime is 621503657. The next prime is 621503741. The reversal of 621503713 is 317305126.

It is an a-pointer prime, because the next prime (621503741) can be obtained adding 621503713 to its sum of digits (28).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 537451489 + 84052224 = 23183^2 + 9168^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-621503713 is a prime.

It is not a weakly prime, because it can be changed into another prime (621503783) 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, 310751856 + 310751857.

It is an arithmetic number, because the mean of its divisors is an integer number (310751857).

Almost surely, 2^621503713 is an apocalyptic number.

It is an amenable number.

621503713 is a deficient number, since it is larger than the sum of its proper divisors (1).

621503713 is an equidigital number, since it uses as much as digits as its factorization.

621503713 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3780, while the sum is 28.

The square root of 621503713 is about 24929.9761933300. The cubic root of 621503713 is about 853.3907067782.

Adding to 621503713 its reverse (317305126), we get a palindrome (938808839).

The spelling of 621503713 in words is "six hundred twenty-one million, five hundred three thousand, seven hundred thirteen".