621334331 has 4 divisors (see below), whose sum is σ = 621384192. Its totient is φ = 621284472.

The previous prime is 621334279. The next prime is 621334339. The reversal of 621334331 is 133433126.

It is a happy number.

621334331 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 a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 621334331 - 2⁶ = 621334267 is a prime.

It is a super-2 number, since 2×621334331² = 772112701758435122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 621334331.

It is not an unprimeable number, because it can be changed into a prime (621334339) 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, 11846 + ... + 37188.

It is an arithmetic number, because the mean of its divisors is an integer number (155346048).

Almost surely, 2^621334331 is an apocalyptic number.

621334331 is a deficient number, since it is larger than the sum of its proper divisors (49861).

621334331 is a wasteful number, since it uses less digits than its factorization.

621334331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49860.

The product of its digits is 3888, while the sum is 26.

The square root of 621334331 is about 24926.5788065671. The cubic root of 621334331 is about 853.3131732332.

Adding to 621334331 its reverse (133433126), we get a palindrome (754767457).

The spelling of 621334331 in words is "six hundred twenty-one million, three hundred thirty-four thousand, three hundred thirty-one".