1209087172225 has 9 divisors (see below), whose sum is σ = 1499274911017. Its totient is φ = 967265339440.

The previous prime is 1209087172193. The next prime is 1209087172283. The reversal of 1209087172225 is 5222717809021.

The square root of 1209087172225 is 1099585.

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 88927414849 + 1120159757376 = 298207^2 + 1058376^2 .

It is not a de Polignac number, because 1209087172225 - 2⁵ = 1209087172193 is a prime.

It is a super-2 number, since 2×1209087172225² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 5387967 + ... + 5607883.

Almost surely, 2^{1209087172225} is an apocalyptic number.

1209087172225 is the 1099585-th square number.

1209087172225 is the 549793-rd centered octagonal number.

It is an amenable number.

1209087172225 is a deficient number, since it is larger than the sum of its proper divisors (290187738792).

1209087172225 is an frugal number, since it uses more digits than its factorization.

1209087172225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 439844 (or 219922 counting only the distinct ones).

The product of its (nonzero) digits is 282240, while the sum is 46.

The spelling of 1209087172225 in words is "one trillion, two hundred nine billion, eighty-seven million, one hundred seventy-two thousand, two hundred twenty-five".