129550005 has 24 divisors (see below), whose sum is σ = 241827768. Its totient is φ = 63778176.

The previous prime is 129549983. The next prime is 129550019. The reversal of 129550005 is 500055921.

It can be written as a sum of positive squares in 4 ways, for example, as 19236996 + 110313009 = 4386^2 + 10503^2 .

It is not a de Polignac number, because 129550005 - 2¹² = 129545909 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 110142 + ... + 111311.

It is an arithmetic number, because the mean of its divisors is an integer number (10076157).

Almost surely, 2^129550005 is an apocalyptic number.

129550005 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

129550005 is a deficient number, since it is larger than the sum of its proper divisors (112277763).

129550005 is a wasteful number, since it uses less digits than its factorization.

129550005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221477 (or 221474 counting only the distinct ones).

The product of its (nonzero) digits is 2250, while the sum is 27.

The square root of 129550005 is about 11382.0035582493. The cubic root of 129550005 is about 505.9945176386.

The spelling of 129550005 in words is "one hundred twenty-nine million, five hundred fifty thousand, five".