129189250 has 16 divisors (see below), whose sum is σ = 241842744. Its totient is φ = 51675600.

The previous prime is 129189211. The next prime is 129189271. The reversal of 129189250 is 52981921.

It can be written as a sum of positive squares in 4 ways, for example, as 68707521 + 60481729 = 8289^2 + 7777^2 .

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 7 ways as a sum of consecutive naturals, for example, 258129 + ... + 258628.

Almost surely, 2^129189250 is an apocalyptic number.

129189250 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

129189250 is a deficient number, since it is larger than the sum of its proper divisors (112653494).

129189250 is an equidigital number, since it uses as much as digits as its factorization.

129189250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 516774 (or 516764 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 37.

The square root of 129189250 is about 11366.1449049359. The cubic root of 129189250 is about 505.5244037928.

The spelling of 129189250 in words is "one hundred twenty-nine million, one hundred eighty-nine thousand, two hundred fifty".