129825999 has 6 divisors (see below), whose sum is σ = 187526456. Its totient is φ = 86550660.

The previous prime is 129825973. The next prime is 129826001. The reversal of 129825999 is 999528921.

It is not a de Polignac number, because 129825999 - 2¹⁵ = 129793231 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129825919) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7212547 + ... + 7212564.

Almost surely, 2^129825999 is an apocalyptic number.

129825999 is a deficient number, since it is larger than the sum of its proper divisors (57700457).

129825999 is a wasteful number, since it uses less digits than its factorization.

129825999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14425117 (or 14425114 counting only the distinct ones).

The product of its digits is 1049760, while the sum is 54.

The square root of 129825999 is about 11394.1212473802. The cubic root of 129825999 is about 506.3535872162.

It can be divided in two parts, 12982 and 5999, that added together give a palindrome (18981).

The spelling of 129825999 in words is "one hundred twenty-nine million, eight hundred twenty-five thousand, nine hundred ninety-nine".