306145217 has 4 divisors (see below), whose sum is σ = 349880256. Its totient is φ = 262410180.

The previous prime is 306145207. The next prime is 306145219. The reversal of 306145217 is 712541603.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 306145217 - 2⁸ = 306144961 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 306145217.

It is not an unprimeable number, because it can be changed into a prime (306145219) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21867509 + ... + 21867522.

It is an arithmetic number, because the mean of its divisors is an integer number (87470064).

Almost surely, 2^306145217 is an apocalyptic number.

It is an amenable number.

306145217 is a deficient number, since it is larger than the sum of its proper divisors (43735039).

306145217 is an equidigital number, since it uses as much as digits as its factorization.

306145217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43735038.

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 306145217 is about 17497.0059438751. The cubic root of 306145217 is about 673.9729911075.

The spelling of 306145217 in words is "three hundred six million, one hundred forty-five thousand, two hundred seventeen".