129772275 has 48 divisors (see below), whose sum is σ = 220057344. Its totient is φ = 67466880.

The previous prime is 129772267. The next prime is 129772289. The reversal of 129772275 is 572277921.

It is not a de Polignac number, because 129772275 - 2³ = 129772267 is a prime.

It is a congruent number.

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 47 ways as a sum of consecutive naturals, for example, 826497 + ... + 826653.

It is an arithmetic number, because the mean of its divisors is an integer number (4584528).

Almost surely, 2^129772275 is an apocalyptic number.

129772275 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

129772275 is a deficient number, since it is larger than the sum of its proper divisors (90285069).

129772275 is a wasteful number, since it uses less digits than its factorization.

129772275 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 380 (or 375 counting only the distinct ones).

The product of its digits is 123480, while the sum is 42.

The square root of 129772275 is about 11391.7634719125. The cubic root of 129772275 is about 506.2837319392.

The spelling of 129772275 in words is "one hundred twenty-nine million, seven hundred seventy-two thousand, two hundred seventy-five".