63281509391 has 2 divisors, whose sum is σ = 63281509392. Its totient is φ = 63281509390.

The previous prime is 63281509321. The next prime is 63281509411. The reversal of 63281509391 is 19390518236.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-63281509391 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (63281509321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31640754695 + 31640754696.

It is an arithmetic number, because the mean of its divisors is an integer number (31640754696).

Almost surely, 2^63281509391 is an apocalyptic number.

63281509391 is a deficient number, since it is larger than the sum of its proper divisors (1).

63281509391 is an equidigital number, since it uses as much as digits as its factorization.

63281509391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 349920, while the sum is 47.

The spelling of 63281509391 in words is "sixty-three billion, two hundred eighty-one million, five hundred nine thousand, three hundred ninety-one".