309145117 has 8 divisors (see below), whose sum is σ = 310590720. Its totient is φ = 307703760.

The previous prime is 309145079. The next prime is 309145121. The reversal of 309145117 is 711541903.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-309145117 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (309145157) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 338892 + ... + 339802.

It is an arithmetic number, because the mean of its divisors is an integer number (38823840).

Almost surely, 2^309145117 is an apocalyptic number.

It is an amenable number.

309145117 is a deficient number, since it is larger than the sum of its proper divisors (1445603).

309145117 is an equidigital number, since it uses as much as digits as its factorization.

309145117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2123.

The product of its (nonzero) digits is 3780, while the sum is 31.

The square root of 309145117 is about 17582.5230555799. The cubic root of 309145117 is about 676.1672474912.

The spelling of 309145117 in words is "three hundred nine million, one hundred forty-five thousand, one hundred seventeen".