63871009 has 2 divisors, whose sum is σ = 63871010. Its totient is φ = 63871008.

The previous prime is 63870997. The next prime is 63871051. The reversal of 63871009 is 90017836.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 48094225 + 15776784 = 6935^2 + 3972^2 .

It is a cyclic number.

It is not a de Polignac number, because 63871009 - 2²⁵ = 30316577 is a prime.

It is not a weakly prime, because it can be changed into another prime (63871109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31935504 + 31935505.

It is an arithmetic number, because the mean of its divisors is an integer number (31935505).

Almost surely, 2^63871009 is an apocalyptic number.

It is an amenable number.

63871009 is a deficient number, since it is larger than the sum of its proper divisors (1).

63871009 is an equidigital number, since it uses as much as digits as its factorization.

63871009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9072, while the sum is 34.

The square root of 63871009 is about 7991.9339962239. The cubic root of 63871009 is about 399.7310880064.

It can be divided in two parts, 6387 and 1009, that added together give a square (7396 = 86²).

The spelling of 63871009 in words is "sixty-three million, eight hundred seventy-one thousand, nine".