129370823 has 2 divisors, whose sum is σ = 129370824. Its totient is φ = 129370822.

The previous prime is 129370817. The next prime is 129370831. The reversal of 129370823 is 328073921.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 129370823 - 2⁸ = 129370567 is a prime.

It is a Sophie Germain prime.

It is equal to p_7344566 and since 129370823 and 7344566 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129370853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64685411 + 64685412.

It is an arithmetic number, because the mean of its divisors is an integer number (64685412).

Almost surely, 2^129370823 is an apocalyptic number.

129370823 is a deficient number, since it is larger than the sum of its proper divisors (1).

129370823 is an equidigital number, since it uses as much as digits as its factorization.

129370823 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18144, while the sum is 35.

The square root of 129370823 is about 11374.1295491128. The cubic root of 129370823 is about 505.7611278579.

The spelling of 129370823 in words is "one hundred twenty-nine million, three hundred seventy thousand, eight hundred twenty-three".