63513481 has 2 divisors, whose sum is σ = 63513482. Its totient is φ = 63513480.

The previous prime is 63513449. The next prime is 63513517. The reversal of 63513481 is 18431536.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 56115081 + 7398400 = 7491^2 + 2720^2 .

It is a cyclic number.

It is not a de Polignac number, because 63513481 - 2⁵ = 63513449 is a prime.

It is a super-2 number, since 2×63513481² = 8067924537474722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (63553481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31756740 + 31756741.

It is an arithmetic number, because the mean of its divisors is an integer number (31756741).

Almost surely, 2^63513481 is an apocalyptic number.

It is an amenable number.

63513481 is a deficient number, since it is larger than the sum of its proper divisors (1).

63513481 is an equidigital number, since it uses as much as digits as its factorization.

63513481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8640, while the sum is 31.

The square root of 63513481 is about 7969.5345535357. The cubic root of 63513481 is about 398.9838394805.

The spelling of 63513481 in words is "sixty-three million, five hundred thirteen thousand, four hundred eighty-one".