129751091 has 4 divisors (see below), whose sum is σ = 129903000. Its totient is φ = 129599184.

The previous prime is 129751051. The next prime is 129751099. The reversal of 129751091 is 190157921.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 129751091 - 2¹⁰ = 129750067 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129751099) 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 3 ways as a sum of consecutive naturals, for example, 74666 + ... + 76383.

It is an arithmetic number, because the mean of its divisors is an integer number (32475750).

Almost surely, 2^129751091 is an apocalyptic number.

129751091 is a deficient number, since it is larger than the sum of its proper divisors (151909).

129751091 is an equidigital number, since it uses as much as digits as its factorization.

129751091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151908.

The product of its (nonzero) digits is 5670, while the sum is 35.

The square root of 129751091 is about 11390.8336393786. The cubic root of 129751091 is about 506.2561818886.

The spelling of 129751091 in words is "one hundred twenty-nine million, seven hundred fifty-one thousand, ninety-one".