63681601 has 4 divisors (see below), whose sum is σ = 63755092. Its totient is φ = 63608112.

The previous prime is 63681587. The next prime is 63681617. The reversal of 63681601 is 10618636.

63681601 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 52128400 + 11553201 = 7220^2 + 3399^2 .

It is a cyclic number.

It is not a de Polignac number, because 63681601 - 2¹³ = 63673409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (63681661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35430 + ... + 37183.

It is an arithmetic number, because the mean of its divisors is an integer number (15938773).

Almost surely, 2^63681601 is an apocalyptic number.

It is an amenable number.

63681601 is a deficient number, since it is larger than the sum of its proper divisors (73491).

63681601 is an equidigital number, since it uses as much as digits as its factorization.

63681601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73490.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 63681601 is about 7980.0752502718. The cubic root of 63681601 is about 399.3355656787.

The spelling of 63681601 in words is "sixty-three million, six hundred eighty-one thousand, six hundred one".