129094505 has 4 divisors (see below), whose sum is σ = 154913412. Its totient is φ = 103275600.

The previous prime is 129094489. The next prime is 129094519. The reversal of 129094505 is 505490921.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 60668521 + 68425984 = 7789^2 + 8272^2 .

It is not a de Polignac number, because 129094505 - 2⁴ = 129094489 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12909446 + ... + 12909455.

It is an arithmetic number, because the mean of its divisors is an integer number (38728353).

Almost surely, 2^129094505 is an apocalyptic number.

It is an amenable number.

129094505 is a deficient number, since it is larger than the sum of its proper divisors (25818907).

129094505 is an equidigital number, since it uses as much as digits as its factorization.

129094505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25818906.

The product of its (nonzero) digits is 16200, while the sum is 35.

The square root of 129094505 is about 11361.9762805596. The cubic root of 129094505 is about 505.4007928291.

The spelling of 129094505 in words is "one hundred twenty-nine million, ninety-four thousand, five hundred five".