63891143 has 2 divisors, whose sum is σ = 63891144. Its totient is φ = 63891142.

The previous prime is 63891131. The next prime is 63891173. The reversal of 63891143 is 34119836.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 63891143 - 2⁴ = 63891127 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (63891103) 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, 31945571 + 31945572.

It is an arithmetic number, because the mean of its divisors is an integer number (31945572).

Almost surely, 2^63891143 is an apocalyptic number.

63891143 is a deficient number, since it is larger than the sum of its proper divisors (1).

63891143 is an equidigital number, since it uses as much as digits as its factorization.

63891143 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15552, while the sum is 35.

The square root of 63891143 is about 7993.1935420081. The cubic root of 63891143 is about 399.7730858826.

The spelling of 63891143 in words is "sixty-three million, eight hundred ninety-one thousand, one hundred forty-three".