309025 has 12 divisors (see below), whose sum is σ = 392832. Its totient is φ = 241040.

The previous prime is 309019. The next prime is 309031. The reversal of 309025 is 520903.

It is an interprime number because it is at equal distance from previous prime (309019) and next prime (309031).

It is not a de Polignac number, because 309025 - 2¹⁵ = 276257 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 13.

It is a junction number, because it is equal to n+sod(n) for n = 308993 and 309011.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1044 + ... + 1306.

It is an arithmetic number, because the mean of its divisors is an integer number (32736).

2³⁰⁹⁰²⁵ is an apocalyptic number.

It is an amenable number.

309025 is a deficient number, since it is larger than the sum of its proper divisors (83807).

309025 is a wasteful number, since it uses less digits than its factorization.

309025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 320 (or 315 counting only the distinct ones).

The product of its (nonzero) digits is 270, while the sum is 19.

The square root of 309025 is about 555.9001708940. The cubic root of 309025 is about 67.6079662192.

Adding to 309025 its reverse (520903), we get a palindrome (829928).

The spelling of 309025 in words is "three hundred nine thousand, twenty-five".