129436897 has 4 divisors (see below), whose sum is σ = 130771396. Its totient is φ = 128102400.

The previous prime is 129436891. The next prime is 129436913. The reversal of 129436897 is 798634921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 798634921 = 7 ⋅114090703.

It can be written as a sum of positive squares in 2 ways, for example, as 44502241 + 84934656 = 6671^2 + 9216^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129436897 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 129436897.

It is not an unprimeable number, because it can be changed into a prime (129436891) 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, 667104 + ... + 667297.

It is an arithmetic number, because the mean of its divisors is an integer number (32692849).

Almost surely, 2^129436897 is an apocalyptic number.

It is an amenable number.

129436897 is a deficient number, since it is larger than the sum of its proper divisors (1334499).

129436897 is an equidigital number, since it uses as much as digits as its factorization.

129436897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1334498.

The product of its digits is 653184, while the sum is 49.

The square root of 129436897 is about 11377.0337522572. The cubic root of 129436897 is about 505.8472162366.

The spelling of 129436897 in words is "one hundred twenty-nine million, four hundred thirty-six thousand, eight hundred ninety-seven".