129296905 has 4 divisors (see below), whose sum is σ = 155156292. Its totient is φ = 103437520.

The previous prime is 129296897. The next prime is 129296927. The reversal of 129296905 is 509692921.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 509692921 = 18803 ⋅27107.

It can be written as a sum of positive squares in 2 ways, for example, as 13927824 + 115369081 = 3732^2 + 10741^2 .

It is not a de Polignac number, because 129296905 - 2³ = 129296897 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, 12929686 + ... + 12929695.

It is an arithmetic number, because the mean of its divisors is an integer number (38789073).

Almost surely, 2^129296905 is an apocalyptic number.

It is an amenable number.

129296905 is a deficient number, since it is larger than the sum of its proper divisors (25859387).

129296905 is an equidigital number, since it uses as much as digits as its factorization.

129296905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25859386.

The product of its (nonzero) digits is 87480, while the sum is 43.

The square root of 129296905 is about 11370.8796933219. The cubic root of 129296905 is about 505.6647847192.

The spelling of 129296905 in words is "one hundred twenty-nine million, two hundred ninety-six thousand, nine hundred five".