129563919 has 12 divisors (see below), whose sum is σ = 198156816. Its totient is φ = 81294912.

The previous prime is 129563881. The next prime is 129563927. The reversal of 129563919 is 919365921.

It is a happy number.

129563919 is a `hidden beast` number, since 1 + 2 + 9 + 5 + 639 + 1 + 9 = 666.

It is not a de Polignac number, because 129563919 - 2¹¹ = 129561871 is a prime.

It is a super-2 number, since 2×129563919² = 33573618213277122, which contains 22 as substring.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129563969) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 423259 + ... + 423564.

It is an arithmetic number, because the mean of its divisors is an integer number (16513068).

Almost surely, 2^129563919 is an apocalyptic number.

129563919 is a deficient number, since it is larger than the sum of its proper divisors (68592897).

129563919 is a wasteful number, since it uses less digits than its factorization.

129563919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 846846 (or 846843 counting only the distinct ones).

The product of its digits is 131220, while the sum is 45.

The square root of 129563919 is about 11382.6147699024. The cubic root of 129563919 is about 506.0126320228.

The spelling of 129563919 in words is "one hundred twenty-nine million, five hundred sixty-three thousand, nine hundred nineteen".