621424613 has 4 divisors (see below), whose sum is σ = 657979020. Its totient is φ = 584870208.

The previous prime is 621424607. The next prime is 621424631. The reversal of 621424613 is 316424126.

621424613 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 316424126 = 2 ⋅158212063.

It can be written as a sum of positive squares in 2 ways, for example, as 318908164 + 302516449 = 17858^2 + 17393^2 .

It is a cyclic number.

It is not a de Polignac number, because 621424613 - 2⁶ = 621424549 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621424633) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18277178 + ... + 18277211.

It is an arithmetic number, because the mean of its divisors is an integer number (164494755).

Almost surely, 2^621424613 is an apocalyptic number.

It is an amenable number.

621424613 is a deficient number, since it is larger than the sum of its proper divisors (36554407).

621424613 is a wasteful number, since it uses less digits than its factorization.

621424613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36554406.

The product of its digits is 6912, while the sum is 29.

The square root of 621424613 is about 24928.3896992967. The cubic root of 621424613 is about 853.3545010042.

Adding to 621424613 its reverse (316424126), we get a palindrome (937848739).

The spelling of 621424613 in words is "six hundred twenty-one million, four hundred twenty-four thousand, six hundred thirteen".