129091252 has 24 divisors (see below), whose sum is σ = 230773536. Its totient is φ = 63162528.

The previous prime is 129091243. The next prime is 129091283. The reversal of 129091252 is 252190921.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 135843 + ... + 136789.

It is an arithmetic number, because the mean of its divisors is an integer number (9615564).

Almost surely, 2^129091252 is an apocalyptic number.

It is an amenable number.

129091252 is a deficient number, since it is larger than the sum of its proper divisors (101682284).

129091252 is a wasteful number, since it uses less digits than its factorization.

129091252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1647 (or 1645 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 31.

The square root of 129091252 is about 11361.8331267450. The cubic root of 129091252 is about 505.3965476637.

It can be divided in two parts, 12909 and 1252, that added together give a square (14161 = 119²).

The spelling of 129091252 in words is "one hundred twenty-nine million, ninety-one thousand, two hundred fifty-two".