815129094025 has 9 divisors (see below), whose sum is σ = 1010765674261. Its totient is φ = 652099663840.

The previous prime is 815129094023. The next prime is 815129094079. The reversal of 815129094025 is 520490921518.

It is a happy number.

The square root of 815129094025 is 902845.

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 22893808249 + 792235285776 = 151307^2 + 890076^2 .

It is not a de Polignac number, because 815129094025 - 2¹ = 815129094023 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (815129094023) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 4423941 + ... + 4604509.

Almost surely, 2^815129094025 is an apocalyptic number.

815129094025 is the 902845-th square number.

815129094025 is the 451423-rd centered octagonal number.

It is an amenable number.

815129094025 is a deficient number, since it is larger than the sum of its proper divisors (195636580236).

815129094025 is an frugal number, since it uses more digits than its factorization.

815129094025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 361148 (or 180574 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 46.

The spelling of 815129094025 in words is "eight hundred fifteen billion, one hundred twenty-nine million, ninety-four thousand, twenty-five".