309087361 has 12 divisors (see below), whose sum is σ = 346158036. Its totient is φ = 275681120.

The previous prime is 309087277. The next prime is 309087407. The reversal of 309087361 is 163780903.

It can be written as a sum of positive squares in 2 ways, for example, as 237160000 + 71927361 = 15400^2 + 8481^2 .

It is not a de Polignac number, because 309087361 - 2¹⁷ = 308956289 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 309087361.

It is not an unprimeable number, because it can be changed into a prime (309087161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17686 + ... + 30511.

It is an arithmetic number, because the mean of its divisors is an integer number (28846503).

Almost surely, 2^309087361 is an apocalyptic number.

It is an amenable number.

309087361 is a deficient number, since it is larger than the sum of its proper divisors (37070675).

309087361 is a wasteful number, since it uses less digits than its factorization.

309087361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48272 (or 48261 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 37.

The square root of 309087361 is about 17580.8805524638. The cubic root of 309087361 is about 676.1251365799.

The spelling of 309087361 in words is "three hundred nine million, eighty-seven thousand, three hundred sixty-one".