306221145 has 16 divisors (see below), whose sum is σ = 490745472. Its totient is φ = 163054080.

The previous prime is 306221137. The next prime is 306221177. The reversal of 306221145 is 541122603.

It is not a de Polignac number, because 306221145 - 2³ = 306221137 is a prime.

It is a super-2 number, since 2×306221145² = 187542779290222050, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6712 + ... + 25641.

It is an arithmetic number, because the mean of its divisors is an integer number (30671592).

Almost surely, 2^306221145 is an apocalyptic number.

It is an amenable number.

306221145 is a deficient number, since it is larger than the sum of its proper divisors (184524327).

306221145 is a wasteful number, since it uses less digits than its factorization.

306221145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32992.

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 306221145 is about 17499.1755520082. The cubic root of 306221145 is about 674.0287045276.

Adding to 306221145 its reverse (541122603), we get a palindrome (847343748).

The spelling of 306221145 in words is "three hundred six million, two hundred twenty-one thousand, one hundred forty-five".