129104813 has 4 divisors (see below), whose sum is σ = 129331488. Its totient is φ = 128878140.

The previous prime is 129104761. The next prime is 129104879. The reversal of 129104813 is 318401921.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 318401921 = 1049 ⋅303529.

It is a cyclic number.

It is not a de Polignac number, because 129104813 - 2¹⁶ = 129039277 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 (129100813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 112481 + ... + 113622.

It is an arithmetic number, because the mean of its divisors is an integer number (32332872).

Almost surely, 2^129104813 is an apocalyptic number.

It is an amenable number.

129104813 is a deficient number, since it is larger than the sum of its proper divisors (226675).

129104813 is an equidigital number, since it uses as much as digits as its factorization.

129104813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 226674.

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 129104813 is about 11362.4298897727. The cubic root of 129104813 is about 505.4142442995.

The spelling of 129104813 in words is "one hundred twenty-nine million, one hundred four thousand, eight hundred thirteen".