129219715225225 has 9 divisors (see below), whose sum is σ = 160232517357717. Its totient is φ = 103375726710240.

The previous prime is 129219715225213. The next prime is 129219715225231. The reversal of 129219715225225 is 522522517912921.

It is a happy number.

The square root of 129219715225225 is 11367485.

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 12830917428729 + 116388797796496 = 3582027^2 + 10788364^2 .

It is not a de Polignac number, because 129219715225225 - 2³⁵ = 129185355486857 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 55700677 + ... + 57974173.

Almost surely, 2^{129219715225225} is an apocalyptic number.

129219715225225 is the 11367485-th square number.

129219715225225 is the 5683743-rd centered octagonal number.

It is an amenable number.

129219715225225 is a deficient number, since it is larger than the sum of its proper divisors (31012802132492).

129219715225225 is an frugal number, since it uses more digits than its factorization.

129219715225225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4547004 (or 2273502 counting only the distinct ones).

The product of its digits is 4536000, while the sum is 55.

The spelling of 129219715225225 in words is "one hundred twenty-nine trillion, two hundred nineteen billion, seven hundred fifteen million, two hundred twenty-five thousand, two hundred twenty-five".