129445553 has 4 divisors (see below), whose sum is σ = 133621248. Its totient is φ = 125269860.

The previous prime is 129445549. The next prime is 129445579. The reversal of 129445553 is 355544921.

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 129445553 - 2² = 129445549 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129445513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2087801 + ... + 2087862.

It is an arithmetic number, because the mean of its divisors is an integer number (33405312).

Almost surely, 2^129445553 is an apocalyptic number.

It is an amenable number.

129445553 is a deficient number, since it is larger than the sum of its proper divisors (4175695).

129445553 is an equidigital number, since it uses as much as digits as its factorization.

129445553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4175694.

The product of its digits is 108000, while the sum is 38.

The square root of 129445553 is about 11377.4141613989. The cubic root of 129445553 is about 505.8584920423.

The spelling of 129445553 in words is "one hundred twenty-nine million, four hundred forty-five thousand, five hundred fifty-three".