129898972225 has 27 divisors (see below), whose sum is σ = 177076100649. Its totient is φ = 94457563200.

The previous prime is 129898972213. The next prime is 129898972243. The reversal of 129898972225 is 522279898921.

The square root of 129898972225 is 360415.

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 11780280369 + 118118691856 = 108537^2 + 343684^2 .

It is not a de Polignac number, because 129898972225 - 2²⁹ = 129362101313 is a prime.

It is a super-2 number, since 2×129898972225² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 19819549 + ... + 19826101.

Almost surely, 2^129898972225 is an apocalyptic number.

129898972225 is the 360415-th square number.

129898972225 is the 180208-th centered octagonal number.

It is an amenable number.

129898972225 is a deficient number, since it is larger than the sum of its proper divisors (47177128424).

129898972225 is an frugal number, since it uses more digits than its factorization.

129898972225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13138 (or 6569 counting only the distinct ones).

The product of its digits is 26127360, while the sum is 64.

Multiplying 129898972225 by its sum of digits (64), we get a square (8313534222400 = 2883320²).

The spelling of 129898972225 in words is "one hundred twenty-nine billion, eight hundred ninety-eight million, nine hundred seventy-two thousand, two hundred twenty-five".