63521351 has 4 divisors (see below), whose sum is σ = 66864600. Its totient is φ = 60178104.

The previous prime is 63521317. The next prime is 63521399. The reversal of 63521351 is 15312536.

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

It is a cyclic number.

It is not a de Polignac number, because 63521351 - 2⁶ = 63521287 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 63521351.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63521251) 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, 1671596 + ... + 1671633.

It is an arithmetic number, because the mean of its divisors is an integer number (16716150).

Almost surely, 2^63521351 is an apocalyptic number.

63521351 is a deficient number, since it is larger than the sum of its proper divisors (3343249).

63521351 is a wasteful number, since it uses less digits than its factorization.

63521351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3343248.

The product of its digits is 2700, while the sum is 26.

The square root of 63521351 is about 7970.0282935508. The cubic root of 63521351 is about 399.0003182557. Note that the first 3 decimals are identical.

Adding to 63521351 its reverse (15312536), we get a palindrome (78833887).

The spelling of 63521351 in words is "sixty-three million, five hundred twenty-one thousand, three hundred fifty-one".