63449681 has 2 divisors, whose sum is σ = 63449682. Its totient is φ = 63449680.

The previous prime is 63449657. The next prime is 63449689. The reversal of 63449681 is 18694436.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39488656 + 23961025 = 6284^2 + 4895^2 .

It is a cyclic number.

It is not a de Polignac number, because 63449681 - 2¹⁴ = 63433297 is a prime.

It is a super-2 number, since 2×63449681² = 8051724038003522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (63449689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31724840 + 31724841.

It is an arithmetic number, because the mean of its divisors is an integer number (31724841).

Almost surely, 2^63449681 is an apocalyptic number.

It is an amenable number.

63449681 is a deficient number, since it is larger than the sum of its proper divisors (1).

63449681 is an equidigital number, since it uses as much as digits as its factorization.

63449681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 124416, while the sum is 41.

The square root of 63449681 is about 7965.5308046608. The cubic root of 63449681 is about 398.8502001509.

The spelling of 63449681 in words is "sixty-three million, four hundred forty-nine thousand, six hundred eighty-one".