129394991 has 4 divisors (see below), whose sum is σ = 141158184. Its totient is φ = 117631800.

The previous prime is 129394963. The next prime is 129395003. The reversal of 129394991 is 199493921.

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

It is not a de Polignac number, because 129394991 - 2⁶ = 129394927 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129394931) 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, 5881580 + ... + 5881601.

It is an arithmetic number, because the mean of its divisors is an integer number (35289546).

Almost surely, 2^129394991 is an apocalyptic number.

129394991 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

129394991 is a deficient number, since it is larger than the sum of its proper divisors (11763193).

129394991 is a wasteful number, since it uses less digits than its factorization.

129394991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11763192.

The product of its digits is 157464, while the sum is 47.

The square root of 129394991 is about 11375.1919104690. The cubic root of 129394991 is about 505.7926199507.

The spelling of 129394991 in words is "one hundred twenty-nine million, three hundred ninety-four thousand, nine hundred ninety-one".