863649129 has 16 divisors (see below), whose sum is σ = 1328817152. Its totient is φ = 488721168.

The previous prime is 863649121. The next prime is 863649173. The reversal of 863649129 is 921946368.

It is not a de Polignac number, because 863649129 - 2³ = 863649121 is a prime.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (863649121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 197479 + ... + 201804.

It is an arithmetic number, because the mean of its divisors is an integer number (83051072).

Almost surely, 2^863649129 is an apocalyptic number.

It is an amenable number.

863649129 is a deficient number, since it is larger than the sum of its proper divisors (465168023).

863649129 is a wasteful number, since it uses less digits than its factorization.

863649129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 399396.

The product of its digits is 559872, while the sum is 48.

The square root of 863649129 is about 29387.9078704150. The cubic root of 863649129 is about 952.3116847904.

The spelling of 863649129 in words is "eight hundred sixty-three million, six hundred forty-nine thousand, one hundred twenty-nine".