63515251 has 4 divisors (see below), whose sum is σ = 64409904. Its totient is φ = 62620600.

The previous prime is 63515239. The next prime is 63515261. The reversal of 63515251 is 15251536.

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 63515251 - 2¹⁵ = 63482483 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (63515201) 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, 447220 + ... + 447361.

It is an arithmetic number, because the mean of its divisors is an integer number (16102476).

Almost surely, 2^63515251 is an apocalyptic number.

63515251 is a deficient number, since it is larger than the sum of its proper divisors (894653).

63515251 is an equidigital number, since it uses as much as digits as its factorization.

63515251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 894652.

The product of its digits is 4500, while the sum is 28.

The square root of 63515251 is about 7969.6456006525. The cubic root of 63515251 is about 398.9875457531.

Adding to 63515251 its reverse (15251536), we get a palindrome (78766787).

The spelling of 63515251 in words is "sixty-three million, five hundred fifteen thousand, two hundred fifty-one".