63681109 has 2 divisors, whose sum is σ = 63681110. Its totient is φ = 63681108.

The previous prime is 63681091. The next prime is 63681131. The reversal of 63681109 is 90118636.

Together with previous prime (63681091) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 60109009 + 3572100 = 7753^2 + 1890^2 .

It is a cyclic number.

It is not a de Polignac number, because 63681109 - 2¹⁷ = 63550037 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (63681139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31840554 + 31840555.

It is an arithmetic number, because the mean of its divisors is an integer number (31840555).

Almost surely, 2^63681109 is an apocalyptic number.

It is an amenable number.

63681109 is a deficient number, since it is larger than the sum of its proper divisors (1).

63681109 is an equidigital number, since it uses as much as digits as its factorization.

63681109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 63681109 is about 7980.0444234352. The cubic root of 63681109 is about 399.3345372623.

The spelling of 63681109 in words is "sixty-three million, six hundred eighty-one thousand, one hundred nine".