129992945 has 8 divisors (see below), whose sum is σ = 156053736. Its totient is φ = 103952896.

The previous prime is 129992923. The next prime is 129992957. The reversal of 129992945 is 549299921.

It can be written as a sum of positive squares in 4 ways, for example, as 1827904 + 128165041 = 1352^2 + 11321^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 129992945 - 2¹² = 129988849 is a prime.

It is a super-3 number, since 3×129992945³ (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 = 129992893 and 129992902.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18209 + ... + 24321.

It is an arithmetic number, because the mean of its divisors is an integer number (19506717).

Almost surely, 2^129992945 is an apocalyptic number.

It is an amenable number.

129992945 is a deficient number, since it is larger than the sum of its proper divisors (26060791).

129992945 is an equidigital number, since it uses as much as digits as its factorization.

129992945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10371.

The product of its digits is 524880, while the sum is 50.

The square root of 129992945 is about 11401.4448645775. Note that the first 3 decimals coincide. The cubic root of 129992945 is about 506.5705378474.

The spelling of 129992945 in words is "one hundred twenty-nine million, nine hundred ninety-two thousand, nine hundred forty-five".