621769 has 2 divisors, whose sum is σ = 621770. Its totient is φ = 621768.

The previous prime is 621757. The next prime is 621779. The reversal of 621769 is 967126.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 490000 + 131769 = 700^2 + 363^2 .

It is a cyclic number.

It is not a de Polignac number, because 621769 - 2⁷ = 621641 is a prime.

It is a super-2 number, since 2×621769² = 773193378722, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 621769.

It is not a weakly prime, because it can be changed into another prime (621739) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310884 + 310885.

It is an arithmetic number, because the mean of its divisors is an integer number (310885).

2⁶²¹⁷⁶⁹ is an apocalyptic number.

It is an amenable number.

621769 is a deficient number, since it is larger than the sum of its proper divisors (1).

621769 is an equidigital number, since it uses as much as digits as its factorization.

621769 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4536, while the sum is 31.

The square root of 621769 is about 788.5233033969. The cubic root of 621769 is about 85.3512111929.

The spelling of 621769 in words is "six hundred twenty-one thousand, seven hundred sixty-nine".