129272751 has 24 divisors (see below), whose sum is σ = 197623920. Its totient is φ = 81202176.

The previous prime is 129272747. The next prime is 129272771. The reversal of 129272751 is 157272921.

It is not a de Polignac number, because 129272751 - 2² = 129272747 is a prime.

It is a super-2 number, since 2×129272751² = 33422888302216002, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129272711) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 31045 + ... + 34961.

It is an arithmetic number, because the mean of its divisors is an integer number (8234330).

Almost surely, 2^129272751 is an apocalyptic number.

129272751 is a deficient number, since it is larger than the sum of its proper divisors (68351169).

129272751 is a wasteful number, since it uses less digits than its factorization.

129272751 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4135 (or 4132 counting only the distinct ones).

The product of its digits is 17640, while the sum is 36.

The square root of 129272751 is about 11369.8175447102. The cubic root of 129272751 is about 505.6332949532.

The spelling of 129272751 in words is "one hundred twenty-nine million, two hundred seventy-two thousand, seven hundred fifty-one".