63994591 has 2 divisors, whose sum is σ = 63994592. Its totient is φ = 63994590.

The previous prime is 63994583. The next prime is 63994597. The reversal of 63994591 is 19549936.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 63994591 - 2³ = 63994583 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (63994597) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31997295 + 31997296.

It is an arithmetic number, because the mean of its divisors is an integer number (31997296).

Almost surely, 2^63994591 is an apocalyptic number.

63994591 is a deficient number, since it is larger than the sum of its proper divisors (1).

63994591 is an equidigital number, since it uses as much as digits as its factorization.

63994591 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 262440, while the sum is 46.

The square root of 63994591 is about 7999.6619303568. The cubic root of 63994591 is about 399.9887309325.

The spelling of 63994591 in words is "sixty-three million, nine hundred ninety-four thousand, five hundred ninety-one".