309245225 has 6 divisors (see below), whose sum is σ = 383464110. Its totient is φ = 247396160.

The previous prime is 309245219. The next prime is 309245231. The reversal of 309245225 is 522542903.

It is an interprime number because it is at equal distance from previous prime (309245219) and next prime (309245231).

It can be written as a sum of positive squares in 3 ways, for example, as 153664 + 309091561 = 392^2 + 17581^2 .

It is not a de Polignac number, because 309245225 - 2⁶ = 309245161 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 309245191 and 309245200.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6184880 + ... + 6184929.

It is an arithmetic number, because the mean of its divisors is an integer number (63910685).

Almost surely, 2^309245225 is an apocalyptic number.

It is an amenable number.

309245225 is a deficient number, since it is larger than the sum of its proper divisors (74218885).

309245225 is a wasteful number, since it uses less digits than its factorization.

309245225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12369819 (or 12369814 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 32.

The square root of 309245225 is about 17585.3696293254. The cubic root of 309245225 is about 676.2402255652.

The spelling of 309245225 in words is "three hundred nine million, two hundred forty-five thousand, two hundred twenty-five".