63921017 has 4 divisors (see below), whose sum is σ = 66125220. Its totient is φ = 61716816.

The previous prime is 63921001. The next prime is 63921019. The reversal of 63921017 is 71012936.

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 13169641 + 50751376 = 3629^2 + 7124^2 .

It is a cyclic number.

It is not a de Polignac number, because 63921017 - 2⁴ = 63921001 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29), and also a Moran number because the ratio is a prime number: 2204173 = 63921017 / (6 + 3 + 9 + 2 + 1 + 0 + 1 + 7).

It is not an unprimeable number, because it can be changed into a prime (63921019) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1102058 + ... + 1102115.

It is an arithmetic number, because the mean of its divisors is an integer number (16531305).

Almost surely, 2^63921017 is an apocalyptic number.

It is an amenable number.

63921017 is a deficient number, since it is larger than the sum of its proper divisors (2204203).

63921017 is a wasteful number, since it uses less digits than its factorization.

63921017 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2204202.

The product of its (nonzero) digits is 2268, while the sum is 29.

The square root of 63921017 is about 7995.0620385335. The cubic root of 63921017 is about 399.8353843468.

The spelling of 63921017 in words is "sixty-three million, nine hundred twenty-one thousand, seventeen".