626640101 has 2 divisors, whose sum is σ = 626640102. Its totient is φ = 626640100.

The previous prime is 626640089. The next prime is 626640127. The reversal of 626640101 is 101046626.

It is a happy number.

626640101 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an a-pointer prime, because the next prime (626640127) can be obtained adding 626640101 to its sum of digits (26).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 618715876 + 7924225 = 24874^2 + 2815^2 .

It is a cyclic number.

It is not a de Polignac number, because 626640101 - 2¹⁰ = 626639077 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (626640401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 313320050 + 313320051.

It is an arithmetic number, because the mean of its divisors is an integer number (313320051).

Almost surely, 2^626640101 is an apocalyptic number.

It is an amenable number.

626640101 is a deficient number, since it is larger than the sum of its proper divisors (1).

626640101 is an equidigital number, since it uses as much as digits as its factorization.

626640101 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 626640101 is about 25032.7805287387. The cubic root of 626640101 is about 855.7351956443.

Adding to 626640101 its reverse (101046626), we get a palindrome (727686727).

The spelling of 626640101 in words is "six hundred twenty-six million, six hundred forty thousand, one hundred one".