621110669 has 2 divisors, whose sum is σ = 621110670. Its totient is φ = 621110668.

The previous prime is 621110647. The next prime is 621110701. The reversal of 621110669 is 966011126.

It is an a-pointer prime, because the next prime (621110701) can be obtained adding 621110669 to its sum of digits (32).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 477422500 + 143688169 = 21850^2 + 11987^2 .

It is a cyclic number.

It is not a de Polignac number, because 621110669 - 2¹² = 621106573 is a prime.

It is a super-3 number, since 3×621110669³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (621110639) 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, 310555334 + 310555335.

It is an arithmetic number, because the mean of its divisors is an integer number (310555335).

Almost surely, 2^621110669 is an apocalyptic number.

It is an amenable number.

621110669 is a deficient number, since it is larger than the sum of its proper divisors (1).

621110669 is an equidigital number, since it uses as much as digits as its factorization.

621110669 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888, while the sum is 32.

The square root of 621110669 is about 24922.0919868297. The cubic root of 621110669 is about 853.2107717688.

The spelling of 621110669 in words is "six hundred twenty-one million, one hundred ten thousand, six hundred sixty-nine".