129823223 has 2 divisors, whose sum is σ = 129823224. Its totient is φ = 129823222.

The previous prime is 129823217. The next prime is 129823231. The reversal of 129823223 is 322328921.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 129823223 - 2¹² = 129819127 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 129823223.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129823123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64911611 + 64911612.

It is an arithmetic number, because the mean of its divisors is an integer number (64911612).

Almost surely, 2^129823223 is an apocalyptic number.

129823223 is a deficient number, since it is larger than the sum of its proper divisors (1).

129823223 is an equidigital number, since it uses as much as digits as its factorization.

129823223 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10368, while the sum is 32.

The square root of 129823223 is about 11393.9994295243. Note that the first 3 decimals coincide. The cubic root of 129823223 is about 506.3499781611.

The spelling of 129823223 in words is "one hundred twenty-nine million, eight hundred twenty-three thousand, two hundred twenty-three".