63771481 has 2 divisors, whose sum is σ = 63771482. Its totient is φ = 63771480.

The previous prime is 63771469. The next prime is 63771497. The reversal of 63771481 is 18417736.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 63744256 + 27225 = 7984^2 + 165^2 .

It is a cyclic number.

It is not a de Polignac number, because 63771481 - 2⁹ = 63770969 is a prime.

It is a super-2 number, since 2×63771481² = 8133603577866722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 63771481.

It is not a weakly prime, because it can be changed into another prime (63771781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31885740 + 31885741.

It is an arithmetic number, because the mean of its divisors is an integer number (31885741).

Almost surely, 2^63771481 is an apocalyptic number.

It is an amenable number.

63771481 is a deficient number, since it is larger than the sum of its proper divisors (1).

63771481 is an equidigital number, since it uses as much as digits as its factorization.

63771481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 28224, while the sum is 37.

The square root of 63771481 is about 7985.7047904365. The cubic root of 63771481 is about 399.5233509899.

The spelling of 63771481 in words is "sixty-three million, seven hundred seventy-one thousand, four hundred eighty-one".