63840101 has 8 divisors (see below), whose sum is σ = 69383160. Its totient is φ = 58387392.

The previous prime is 63840089. The next prime is 63840103. The reversal of 63840101 is 10104836.

It is a Cunningham number, because it is equal to 7990²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 9449476 + 54390625 = 3074^2 + 7375^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 63840101 - 2²² = 59645797 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63840103) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21110 + ... + 23943.

It is an arithmetic number, because the mean of its divisors is an integer number (8672895).

Almost surely, 2^63840101 is an apocalyptic number.

It is an amenable number.

63840101 is a deficient number, since it is larger than the sum of its proper divisors (5543059).

63840101 is a wasteful number, since it uses less digits than its factorization.

63840101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45175.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 63840101 is about 7990.0000625782. Note that the first 4 decimals coincide. The cubic root of 63840101 is about 399.6665992704. Note that the first 3 decimals are identical.

Adding to 63840101 its reverse (10104836), we get a palindrome (73944937).

The spelling of 63840101 in words is "sixty-three million, eight hundred forty thousand, one hundred one".