621442641 has 4 divisors (see below), whose sum is σ = 828590192. Its totient is φ = 414295092.

The previous prime is 621442631. The next prime is 621442651. The reversal of 621442641 is 146244126.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (621442631) and next prime (621442651).

It is not a de Polignac number, because 621442641 - 2⁵ = 621442609 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 621442599 and 621442608.

It is not an unprimeable number, because it can be changed into a prime (621442631) 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 in 3 ways as a sum of consecutive naturals, for example, 103573771 + ... + 103573776.

It is an arithmetic number, because the mean of its divisors is an integer number (207147548).

Almost surely, 2^621442641 is an apocalyptic number.

It is an amenable number.

621442641 is a deficient number, since it is larger than the sum of its proper divisors (207147551).

621442641 is a wasteful number, since it uses less digits than its factorization.

621442641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207147550.

The product of its digits is 9216, while the sum is 30.

The square root of 621442641 is about 24928.7512924334. The cubic root of 621442641 is about 853.3627530785.

Adding to 621442641 its reverse (146244126), we get a palindrome (767686767).

The spelling of 621442641 in words is "six hundred twenty-one million, four hundred forty-two thousand, six hundred forty-one".