129149989 has 4 divisors (see below), whose sum is σ = 129214656. Its totient is φ = 129085324.

The previous prime is 129149957. The next prime is 129150001. The reversal of 129149989 is 989941921.

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 129149989 - 2⁵ = 129149957 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 (129149929) 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, 29239 + ... + 33364.

It is an arithmetic number, because the mean of its divisors is an integer number (32303664).

Almost surely, 2^129149989 is an apocalyptic number.

It is an amenable number.

129149989 is a deficient number, since it is larger than the sum of its proper divisors (64667).

129149989 is an equidigital number, since it uses as much as digits as its factorization.

129149989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64666.

The product of its digits is 419904, while the sum is 52.

The square root of 129149989 is about 11364.4176709588. The cubic root of 129149989 is about 505.4731884775.

The spelling of 129149989 in words is "one hundred twenty-nine million, one hundred forty-nine thousand, nine hundred eighty-nine".