621223381 has 2 divisors, whose sum is σ = 621223382. Its totient is φ = 621223380.

The previous prime is 621223283. The next prime is 621223391. The reversal of 621223381 is 183322126.

621223381 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 414122500 + 207100881 = 20350^2 + 14391^2 .

It is a cyclic number.

It is not a de Polignac number, because 621223381 - 2²⁹ = 84352469 is a prime.

It is a super-2 number, since 2×621223381² = 771836978202142322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (621223391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310611690 + 310611691.

It is an arithmetic number, because the mean of its divisors is an integer number (310611691).

Almost surely, 2^621223381 is an apocalyptic number.

It is an amenable number.

621223381 is a deficient number, since it is larger than the sum of its proper divisors (1).

621223381 is an equidigital number, since it uses as much as digits as its factorization.

621223381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3456, while the sum is 28.

The square root of 621223381 is about 24924.3531711457. The cubic root of 621223381 is about 853.2623789304.

The spelling of 621223381 in words is "six hundred twenty-one million, two hundred twenty-three thousand, three hundred eighty-one".