129163225 has 9 divisors (see below), whose sum is σ = 160232893. Its totient is φ = 103285120.

The previous prime is 129163219. The next prime is 129163253. The reversal of 129163225 is 522361921.

The square root of 129163225 is 11365.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 11744329 + 117418896 = 3427^2 + 10836^2 .

It is not a de Polignac number, because 129163225 - 2¹¹ = 129161177 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 55689 + ... + 57961.

Almost surely, 2^129163225 is an apocalyptic number.

129163225 is the 11365-th square number.

129163225 is the 5683-rd centered octagonal number.

It is an amenable number.

129163225 is a deficient number, since it is larger than the sum of its proper divisors (31069668).

129163225 is an frugal number, since it uses more digits than its factorization.

129163225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4556 (or 2278 counting only the distinct ones).

The product of its digits is 6480, while the sum is 31.

The cubic root of 129163225 is about 505.4904557769.

It can be divided in two parts, 1291 and 63225, that added together give a square (64516 = 254²).

The spelling of 129163225 in words is "one hundred twenty-nine million, one hundred sixty-three thousand, two hundred twenty-five".