626609 has 2 divisors, whose sum is σ = 626610. Its totient is φ = 626608.

The previous prime is 626599. The next prime is 626611. The reversal of 626609 is 906626.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 595984 + 30625 = 772^2 + 175^2 .

It is a cyclic number.

It is not a de Polignac number, because 626609 - 2¹² = 622513 is a prime.

Together with 626611, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (626629) 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, 313304 + 313305.

It is an arithmetic number, because the mean of its divisors is an integer number (313305).

2⁶²⁶⁶⁰⁹ is an apocalyptic number.

It is an amenable number.

626609 is a deficient number, since it is larger than the sum of its proper divisors (1).

626609 is an equidigital number, since it uses as much as digits as its factorization.

626609 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 29.

The square root of 626609 is about 791.5863818940. The cubic root of 626609 is about 85.5721038310.

The spelling of 626609 in words is "six hundred twenty-six thousand, six hundred nine".