621334403 has 2 divisors, whose sum is σ = 621334404. Its totient is φ = 621334402.

The previous prime is 621334393. The next prime is 621334433. The reversal of 621334403 is 304433126.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 621334403 - 2⁶ = 621334339 is a prime.

It is not a weakly prime, because it can be changed into another prime (621334433) 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 as a sum of consecutive naturals, namely, 310667201 + 310667202.

It is an arithmetic number, because the mean of its divisors is an integer number (310667202).

Almost surely, 2^621334403 is an apocalyptic number.

621334403 is a deficient number, since it is larger than the sum of its proper divisors (1).

621334403 is an equidigital number, since it uses as much as digits as its factorization.

621334403 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 26.

The square root of 621334403 is about 24926.5802508086. The cubic root of 621334403 is about 853.3132061937.

Adding to 621334403 its reverse (304433126), we get a palindrome (925767529).

The spelling of 621334403 in words is "six hundred twenty-one million, three hundred thirty-four thousand, four hundred three".