129089505 has 16 divisors (see below), whose sum is σ = 208373760. Its totient is φ = 68237568.

The previous prime is 129089491. The next prime is 129089507. The reversal of 129089505 is 505980921.

It is not a de Polignac number, because 129089505 - 2⁷ = 129089377 is a prime.

It is a super-2 number, since 2×129089505² = 33328200602290050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (129089507) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36385 + ... + 39774.

It is an arithmetic number, because the mean of its divisors is an integer number (13023360).

Almost surely, 2^129089505 is an apocalyptic number.

129089505 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

129089505 is a deficient number, since it is larger than the sum of its proper divisors (79284255).

129089505 is a wasteful number, since it uses less digits than its factorization.

129089505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76280.

The product of its (nonzero) digits is 32400, while the sum is 39.

The square root of 129089505 is about 11361.7562462852. The cubic root of 129089505 is about 505.3942677991.

The spelling of 129089505 in words is "one hundred twenty-nine million, eighty-nine thousand, five hundred five".