621733261 has 2 divisors, whose sum is σ = 621733262. Its totient is φ = 621733260.

The previous prime is 621733247. The next prime is 621733271. The reversal of 621733261 is 162337126.

621733261 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., 604668100 + 17065161 = 24590^2 + 4131^2 .

It is a cyclic number.

It is not a de Polignac number, because 621733261 - 2¹¹ = 621731213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (621733201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310866630 + 310866631.

It is an arithmetic number, because the mean of its divisors is an integer number (310866631).

Almost surely, 2^621733261 is an apocalyptic number.

It is an amenable number.

621733261 is a deficient number, since it is larger than the sum of its proper divisors (1).

621733261 is an equidigital number, since it uses as much as digits as its factorization.

621733261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9072, while the sum is 31.

The square root of 621733261 is about 24934.5796234867. The cubic root of 621733261 is about 853.4957584528.

The spelling of 621733261 in words is "six hundred twenty-one million, seven hundred thirty-three thousand, two hundred sixty-one".