621064513 has 2 divisors, whose sum is σ = 621064514. Its totient is φ = 621064512.

The previous prime is 621064511. The next prime is 621064537. The reversal of 621064513 is 315460126.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 354493584 + 266570929 = 18828^2 + 16327^2 .

It is a cyclic number.

It is not a de Polignac number, because 621064513 - 2¹ = 621064511 is a prime.

It is a super-2 number, since 2×621064513² = 771442258615854338, which contains 22 as substring.

Together with 621064511, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (621064511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310532256 + 310532257.

It is an arithmetic number, because the mean of its divisors is an integer number (310532257).

Almost surely, 2^621064513 is an apocalyptic number.

It is an amenable number.

621064513 is a deficient number, since it is larger than the sum of its proper divisors (1).

621064513 is an equidigital number, since it uses as much as digits as its factorization.

621064513 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 621064513 is about 24921.1659638950. The cubic root of 621064513 is about 853.1896366346.

The spelling of 621064513 in words is "six hundred twenty-one million, sixty-four thousand, five hundred thirteen".