63643109 has 2 divisors, whose sum is σ = 63643110. Its totient is φ = 63643108.

The previous prime is 63643091. The next prime is 63643117. The reversal of 63643109 is 90134636.

It is a happy number.

Together with previous prime (63643091) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 57988225 + 5654884 = 7615^2 + 2378^2 .

It is a cyclic number.

It is not a de Polignac number, because 63643109 - 2¹² = 63639013 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (63643169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31821554 + 31821555.

It is an arithmetic number, because the mean of its divisors is an integer number (31821555).

Almost surely, 2^63643109 is an apocalyptic number.

It is an amenable number.

63643109 is a deficient number, since it is larger than the sum of its proper divisors (1).

63643109 is an equidigital number, since it uses as much as digits as its factorization.

63643109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11664, while the sum is 32.

The square root of 63643109 is about 7977.6631290122. The cubic root of 63643109 is about 399.2550907199.

The spelling of 63643109 in words is "sixty-three million, six hundred forty-three thousand, one hundred nine".