129009149 has 8 divisors (see below), whose sum is σ = 130954680. Its totient is φ = 127074816.

The previous prime is 129009119. The next prime is 129009161. The reversal of 129009149 is 941900921.

It can be written as a sum of positive squares in 4 ways, for example, as 14668900 + 114340249 = 3830^2 + 10693^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129009149 is a prime.

It is a super-3 number, since 3×129009149³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129009119) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22037 + ... + 27269.

It is an arithmetic number, because the mean of its divisors is an integer number (16369335).

Almost surely, 2^129009149 is an apocalyptic number.

It is an amenable number.

129009149 is a deficient number, since it is larger than the sum of its proper divisors (1945531).

129009149 is an equidigital number, since it uses as much as digits as its factorization.

129009149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5599.

The product of its (nonzero) digits is 5832, while the sum is 35.

The square root of 129009149 is about 11358.2194467267. The cubic root of 129009149 is about 505.2893796148.

The spelling of 129009149 in words is "one hundred twenty-nine million, nine thousand, one hundred forty-nine".