63215381 has 2 divisors, whose sum is σ = 63215382. Its totient is φ = 63215380.

The previous prime is 63215377. The next prime is 63215429. The reversal of 63215381 is 18351236.

63215381 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 60684100 + 2531281 = 7790^2 + 1591^2 .

It is a cyclic number.

It is not a de Polignac number, because 63215381 - 2² = 63215377 is a prime.

It is a super-2 number, since 2×63215381² = 7992368789950322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (63215311) 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 as a sum of consecutive naturals, namely, 31607690 + 31607691.

It is an arithmetic number, because the mean of its divisors is an integer number (31607691).

Almost surely, 2^63215381 is an apocalyptic number.

It is an amenable number.

63215381 is a deficient number, since it is larger than the sum of its proper divisors (1).

63215381 is an equidigital number, since it uses as much as digits as its factorization.

63215381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4320, while the sum is 29.

The square root of 63215381 is about 7950.8100845134. The cubic root of 63215381 is about 398.3586512310.

The spelling of 63215381 in words is "sixty-three million, two hundred fifteen thousand, three hundred eighty-one".