129368091 has 4 divisors (see below), whose sum is σ = 172490792. Its totient is φ = 86245392.

The previous prime is 129368081. The next prime is 129368119. The reversal of 129368091 is 190863921.

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

It is not a de Polignac number, because 129368091 - 2¹⁴ = 129351707 is a prime.

It is a super-2 number, since 2×129368091² = 33472205937968562, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129368051) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21561346 + ... + 21561351.

It is an arithmetic number, because the mean of its divisors is an integer number (43122698).

Almost surely, 2^129368091 is an apocalyptic number.

129368091 is a deficient number, since it is larger than the sum of its proper divisors (43122701).

129368091 is an equidigital number, since it uses as much as digits as its factorization.

129368091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43122700.

The product of its (nonzero) digits is 23328, while the sum is 39.

The square root of 129368091 is about 11374.0094513764. The cubic root of 129368091 is about 505.7575676808.

The spelling of 129368091 in words is "one hundred twenty-nine million, three hundred sixty-eight thousand, ninety-one".