309252425 has 12 divisors (see below), whose sum is σ = 383760780. Its totient is φ = 247216320.

The previous prime is 309252421. The next prime is 309252473. The reversal of 309252425 is 524252903.

It can be written as a sum of positive squares in 6 ways, for example, as 12138256 + 297114169 = 3484^2 + 17237^2 .

It is not a de Polignac number, because 309252425 - 2² = 309252421 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 309252391 and 309252400.

It is not an unprimeable number, because it can be changed into a prime (309252421) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 36491 + ... + 44159.

It is an arithmetic number, because the mean of its divisors is an integer number (31980065).

Almost surely, 2^309252425 is an apocalyptic number.

It is an amenable number.

309252425 is a deficient number, since it is larger than the sum of its proper divisors (74508355).

309252425 is a wasteful number, since it uses less digits than its factorization.

309252425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9292 (or 9287 counting only the distinct ones).

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

The square root of 309252425 is about 17585.5743437626. The cubic root of 309252425 is about 676.2454737107.

The spelling of 309252425 in words is "three hundred nine million, two hundred fifty-two thousand, four hundred twenty-five".