129149945 has 16 divisors (see below), whose sum is σ = 162190080. Its totient is φ = 98539584.

The previous prime is 129149929. The next prime is 129149957. The reversal of 129149945 is 549941921.

It is a cyclic number.

It is not a de Polignac number, because 129149945 - 2⁴ = 129149929 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 129149896 and 129149905.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43292 + ... + 46178.

It is an arithmetic number, because the mean of its divisors is an integer number (10136880).

Almost surely, 2^129149945 is an apocalyptic number.

It is an amenable number.

129149945 is a deficient number, since it is larger than the sum of its proper divisors (33040135).

129149945 is a wasteful number, since it uses less digits than its factorization.

129149945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3304.

The product of its digits is 116640, while the sum is 44.

The square root of 129149945 is about 11364.4157350917. The cubic root of 129149945 is about 505.4731310744.

The spelling of 129149945 in words is "one hundred twenty-nine million, one hundred forty-nine thousand, nine hundred forty-five".