129315911 has 4 divisors (see below), whose sum is σ = 133487424. Its totient is φ = 125144400.

The previous prime is 129315899. The next prime is 129315917. The reversal of 129315911 is 119513921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 119513921 = 73 ⋅1637177.

It is a cyclic number.

It is not a de Polignac number, because 129315911 - 2¹⁸ = 129053767 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 (129315917) 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, 2085710 + ... + 2085771.

It is an arithmetic number, because the mean of its divisors is an integer number (33371856).

Almost surely, 2^129315911 is an apocalyptic number.

129315911 is a deficient number, since it is larger than the sum of its proper divisors (4171513).

129315911 is an equidigital number, since it uses as much as digits as its factorization.

129315911 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4171512.

The product of its digits is 2430, while the sum is 32.

The square root of 129315911 is about 11371.7153939061. The cubic root of 129315911 is about 505.6895602388.

The spelling of 129315911 in words is "one hundred twenty-nine million, three hundred fifteen thousand, nine hundred eleven".