621223313 has 4 divisors (see below), whose sum is σ = 624655668. Its totient is φ = 617790960.

The previous prime is 621223283. The next prime is 621223381. The reversal of 621223313 is 313322126.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 22344529 + 598878784 = 4727^2 + 24472^2 .

It is a cyclic number.

It is not a de Polignac number, because 621223313 - 2⁶ = 621223249 is a prime.

It is a super-2 number, since 2×621223313² = 771836809229391938, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (621223013) 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, 1715906 + ... + 1716267.

It is an arithmetic number, because the mean of its divisors is an integer number (156163917).

Almost surely, 2^621223313 is an apocalyptic number.

It is an amenable number.

621223313 is a deficient number, since it is larger than the sum of its proper divisors (3432355).

621223313 is a wasteful number, since it uses less digits than its factorization.

621223313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3432354.

The product of its digits is 1296, while the sum is 23.

The square root of 621223313 is about 24924.3518070180. The cubic root of 621223313 is about 853.2623477973.

Adding to 621223313 its reverse (313322126), we get a palindrome (934545439).

The spelling of 621223313 in words is "six hundred twenty-one million, two hundred twenty-three thousand, three hundred thirteen".