129188146 has 4 divisors (see below), whose sum is σ = 193782222. Its totient is φ = 64594072.

The previous prime is 129188119. The next prime is 129188153. The reversal of 129188146 is 641881921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 641881921 = 19 ⋅33783259.

It can be written as a sum of positive squares in only one way, i.e., 126315121 + 2873025 = 11239^2 + 1695^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 129188099 and 129188108.

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 as a sum of consecutive naturals, namely, 32297035 + ... + 32297038.

Almost surely, 2^129188146 is an apocalyptic number.

129188146 is a deficient number, since it is larger than the sum of its proper divisors (64594076).

129188146 is an equidigital number, since it uses as much as digits as its factorization.

129188146 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64594075.

The product of its digits is 27648, while the sum is 40.

The square root of 129188146 is about 11366.0963395530. The cubic root of 129188146 is about 505.5229637852.

The spelling of 129188146 in words is "one hundred twenty-nine million, one hundred eighty-eight thousand, one hundred forty-six".