621634013 has 16 divisors (see below), whose sum is σ = 834642816. Its totient is φ = 447128640.

The previous prime is 621633977. The next prime is 621634031. The reversal of 621634013 is 310436126.

621634013 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 621634013 - 2¹² = 621629917 is a prime.

It is a super-2 number, since 2×621634013² = 772857692236968338, which contains 22 as substring.

It is a Smith number, since the sum of its digits (26) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621634043) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 309506 + ... + 311507.

It is an arithmetic number, because the mean of its divisors is an integer number (52165176).

Almost surely, 2^621634013 is an apocalyptic number.

It is an amenable number.

621634013 is a deficient number, since it is larger than the sum of its proper divisors (213008803).

621634013 is a wasteful number, since it uses less digits than its factorization.

621634013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 621044.

The product of its (nonzero) digits is 2592, while the sum is 26.

The square root of 621634013 is about 24932.5893761559. The cubic root of 621634013 is about 853.4503411975.

The spelling of 621634013 in words is "six hundred twenty-one million, six hundred thirty-four thousand, thirteen".