63491473 has 2 divisors, whose sum is σ = 63491474. Its totient is φ = 63491472.

The previous prime is 63491471. The next prime is 63491507. The reversal of 63491473 is 37419436.

63491473 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., 56896849 + 6594624 = 7543^2 + 2568^2 .

It is a cyclic number.

It is not a de Polignac number, because 63491473 - 2¹ = 63491471 is a prime.

Together with 63491471, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (63491471) 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, 31745736 + 31745737.

It is an arithmetic number, because the mean of its divisors is an integer number (31745737).

Almost surely, 2^63491473 is an apocalyptic number.

It is an amenable number.

63491473 is a deficient number, since it is larger than the sum of its proper divisors (1).

63491473 is an equidigital number, since it uses as much as digits as its factorization.

63491473 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 54432, while the sum is 37.

The square root of 63491473 is about 7968.1536757269. The cubic root of 63491473 is about 398.9377503111.

It can be divided in two parts, 63 and 491473, that added together give a triangular number (491536 = T₉₉₁).

The spelling of 63491473 in words is "sixty-three million, four hundred ninety-one thousand, four hundred seventy-three".