63215257 has 4 divisors (see below), whose sum is σ = 72246016. Its totient is φ = 54184500.

The previous prime is 63215249. The next prime is 63215263. The reversal of 63215257 is 75251236.

63215257 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, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 63215257 - 2³ = 63215249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (63215267) 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, 4515369 + ... + 4515382.

It is an arithmetic number, because the mean of its divisors is an integer number (18061504).

Almost surely, 2^63215257 is an apocalyptic number.

It is an amenable number.

63215257 is a deficient number, since it is larger than the sum of its proper divisors (9030759).

63215257 is an equidigital number, since it uses as much as digits as its factorization.

63215257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9030758.

The product of its digits is 12600, while the sum is 31.

The square root of 63215257 is about 7950.8022865620. The cubic root of 63215257 is about 398.3583907643.

The spelling of 63215257 in words is "sixty-three million, two hundred fifteen thousand, two hundred fifty-seven".