309397375225 has 27 divisors (see below), whose sum is σ = 391214437453. Its totient is φ = 242732054240.

The previous prime is 309397375213. The next prime is 309397375229. The reversal of 309397375225 is 522573793903.

The square root of 309397375225 is 556235.

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 2330668729 + 307066706496 = 48277^2 + 554136^2 .

It is not a de Polignac number, because 309397375225 - 2¹³ = 309397367033 is a prime.

It is a super-2 number, since 2×309397375225² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (309397375229) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 147401226 + ... + 147403324.

Almost surely, 2^309397375225 is an apocalyptic number.

309397375225 is the 556235-th square number.

309397375225 is the 278118-th centered octagonal number.

It is an amenable number.

309397375225 is a deficient number, since it is larger than the sum of its proper divisors (81817062228).

309397375225 is an frugal number, since it uses more digits than its factorization.

309397375225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4314 (or 2157 counting only the distinct ones).

The product of its (nonzero) digits is 10716300, while the sum is 55.

The spelling of 309397375225 in words is "three hundred nine billion, three hundred ninety-seven million, three hundred seventy-five thousand, two hundred twenty-five".