63681587 has 2 divisors, whose sum is σ = 63681588. Its totient is φ = 63681586.

The previous prime is 63681571. The next prime is 63681617. The reversal of 63681587 is 78518636.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 63681587 - 2⁴ = 63681571 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (63681517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31840793 + 31840794.

It is an arithmetic number, because the mean of its divisors is an integer number (31840794).

Almost surely, 2^63681587 is an apocalyptic number.

63681587 is a deficient number, since it is larger than the sum of its proper divisors (1).

63681587 is an equidigital number, since it uses as much as digits as its factorization.

63681587 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 241920, while the sum is 44.

The square root of 63681587 is about 7980.0743730870. The cubic root of 63681587 is about 399.3355364149.

The spelling of 63681587 in words is "sixty-three million, six hundred eighty-one thousand, five hundred eighty-seven".