129012825 has 12 divisors (see below), whose sum is σ = 213301328. Its totient is φ = 68806800.

The previous prime is 129012817. The next prime is 129012833. The reversal of 129012825 is 528210921.

It is an interprime number because it is at equal distance from previous prime (129012817) and next prime (129012833).

It is not a de Polignac number, because 129012825 - 2³ = 129012817 is a prime.

It is a super-3 number, since 3×129012825³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 129012792 and 129012801.

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 11 ways as a sum of consecutive naturals, for example, 860011 + ... + 860160.

Almost surely, 2^129012825 is an apocalyptic number.

129012825 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

129012825 is a deficient number, since it is larger than the sum of its proper divisors (84288503).

129012825 is a wasteful number, since it uses less digits than its factorization.

129012825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1720184 (or 1720179 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 30.

The square root of 129012825 is about 11358.3812667123. The cubic root of 129012825 is about 505.2941788252.

The spelling of 129012825 in words is "one hundred twenty-nine million, twelve thousand, eight hundred twenty-five".