129000056 has 32 divisors (see below), whose sum is σ = 250795440. Its totient is φ = 62155008.

The previous prime is 129000049. The next prime is 129000103. The reversal of 129000056 is 650000921.

It is a junction number, because it is equal to n+sod(n) for n = 128999995 and 129000040.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29636 + ... + 33708.

Almost surely, 2^129000056 is an apocalyptic number.

It is an amenable number.

129000056 is a deficient number, since it is larger than the sum of its proper divisors (121795384).

129000056 is a wasteful number, since it uses less digits than its factorization.

129000056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4223 (or 4219 counting only the distinct ones).

The product of its (nonzero) digits is 540, while the sum is 23.

The square root of 129000056 is about 11357.8191568628. The cubic root of 129000056 is about 505.2775078359.

Adding to 129000056 its reverse (650000921), we get a palindrome (779000977).

The spelling of 129000056 in words is "one hundred twenty-nine million, fifty-six", and thus it is an aban number.