129877348225 has 9 divisors (see below), whose sum is σ = 161050146217. Its totient is φ = 103900437040.

The previous prime is 129877348201. The next prime is 129877348231. The reversal of 129877348225 is 522843778921.

The square root of 129877348225 is 360385.

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 52584451969 + 77292896256 = 229313^2 + 278016^2 .

It is not a de Polignac number, because 129877348225 - 2⁵ = 129877348193 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 129877348225.

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, 1765887 + ... + 1837963.

Almost surely, 2^129877348225 is an apocalyptic number.

129877348225 is the 360385-th square number.

129877348225 is the 180193-rd centered octagonal number.

It is an amenable number.

129877348225 is a deficient number, since it is larger than the sum of its proper divisors (31172797992).

129877348225 is an frugal number, since it uses more digits than its factorization.

129877348225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144164 (or 72082 counting only the distinct ones).

The product of its digits is 13547520, while the sum is 58.

The spelling of 129877348225 in words is "one hundred twenty-nine billion, eight hundred seventy-seven million, three hundred forty-eight thousand, two hundred twenty-five".