63915949 has 2 divisors, whose sum is σ = 63915950. Its totient is φ = 63915948.

The previous prime is 63915947. The next prime is 63915959. The reversal of 63915949 is 94951936.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 47513449 + 16402500 = 6893^2 + 4050^2 .

It is a cyclic number.

It is not a de Polignac number, because 63915949 - 2¹ = 63915947 is a prime.

It is a super-3 number, since 3×63915949³ (a number of 24 digits) contains 333 as substring.

Together with 63915947, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 63915899 and 63915908.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (63915941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31957974 + 31957975.

It is an arithmetic number, because the mean of its divisors is an integer number (31957975).

Almost surely, 2^63915949 is an apocalyptic number.

It is an amenable number.

63915949 is a deficient number, since it is larger than the sum of its proper divisors (1).

63915949 is an equidigital number, since it uses as much as digits as its factorization.

63915949 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 262440, while the sum is 46.

The square root of 63915949 is about 7994.7450866178. The cubic root of 63915949 is about 399.8248170385.

The spelling of 63915949 in words is "sixty-three million, nine hundred fifteen thousand, nine hundred forty-nine".