129324813 has 4 divisors (see below), whose sum is σ = 172433088. Its totient is φ = 86216540.

The previous prime is 129324803. The next prime is 129324827. The reversal of 129324813 is 318423921.

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.

It is a cyclic number.

It is not a de Polignac number, because 129324813 - 2⁶ = 129324749 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129324803) 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, 21554133 + ... + 21554138.

It is an arithmetic number, because the mean of its divisors is an integer number (43108272).

Almost surely, 2^129324813 is an apocalyptic number.

It is an amenable number.

129324813 is a deficient number, since it is larger than the sum of its proper divisors (43108275).

129324813 is an equidigital number, since it uses as much as digits as its factorization.

129324813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43108274.

The product of its digits is 10368, while the sum is 33.

The square root of 129324813 is about 11372.1067968956. The cubic root of 129324813 is about 505.7011637225.

It can be divided in two parts, 1293 and 24813, that added together give a triangular number (26106 = T₂₂₈).

The spelling of 129324813 in words is "one hundred twenty-nine million, three hundred twenty-four thousand, eight hundred thirteen".