129443573 has 4 divisors (see below), whose sum is σ = 147935520. Its totient is φ = 110951628.

The previous prime is 129443549. The next prime is 129443597. The reversal of 129443573 is 375344921.

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 an interprime number because it is at equal distance from previous prime (129443549) and next prime (129443597).

It is a cyclic number.

It is not a de Polignac number, because 129443573 - 2²⁰ = 128394997 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 (129443513) 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, 9245963 + ... + 9245976.

It is an arithmetic number, because the mean of its divisors is an integer number (36983880).

Almost surely, 2^129443573 is an apocalyptic number.

It is an amenable number.

129443573 is a deficient number, since it is larger than the sum of its proper divisors (18491947).

129443573 is an equidigital number, since it uses as much as digits as its factorization.

129443573 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18491946.

The product of its digits is 90720, while the sum is 38.

The square root of 129443573 is about 11377.3271465665. The cubic root of 129443573 is about 505.8559128243.

The spelling of 129443573 in words is "one hundred twenty-nine million, four hundred forty-three thousand, five hundred seventy-three".