129223243 has 4 divisors (see below), whose sum is σ = 129251488. Its totient is φ = 129195000.

The previous prime is 129223207. The next prime is 129223249. The reversal of 129223243 is 342322921.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 129223243 - 2²¹ = 127126091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129223249) 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, 5508 + ... + 16993.

It is an arithmetic number, because the mean of its divisors is an integer number (32312872).

Almost surely, 2^129223243 is an apocalyptic number.

129223243 is a deficient number, since it is larger than the sum of its proper divisors (28245).

129223243 is an equidigital number, since it uses as much as digits as its factorization.

129223243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28244.

The product of its digits is 5184, while the sum is 28.

The square root of 129223243 is about 11367.6401684782. The cubic root of 129223243 is about 505.5687387099.

The spelling of 129223243 in words is "one hundred twenty-nine million, two hundred twenty-three thousand, two hundred forty-three".