621442653 has 24 divisors (see below), whose sum is σ = 924207648. Its totient is φ = 369219648.

The previous prime is 621442651. The next prime is 621442687. The reversal of 621442653 is 356244126.

621442653 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 621442653 - 2¹ = 621442651 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621442651) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 23326 + ... + 42272.

It is an arithmetic number, because the mean of its divisors is an integer number (38508652).

Almost surely, 2^621442653 is an apocalyptic number.

It is an amenable number.

621442653 is a deficient number, since it is larger than the sum of its proper divisors (302764995).

621442653 is a wasteful number, since it uses less digits than its factorization.

621442653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19021 (or 18992 counting only the distinct ones).

The product of its digits is 34560, while the sum is 33.

The square root of 621442653 is about 24928.7515331193. The cubic root of 621442653 is about 853.3627585712.

Adding to 621442653 its reverse (356244126), we get a palindrome (977686779).

The spelling of 621442653 in words is "six hundred twenty-one million, four hundred forty-two thousand, six hundred fifty-three".