305213231 has 2 divisors, whose sum is σ = 305213232. Its totient is φ = 305213230.

The previous prime is 305213201. The next prime is 305213329. The reversal of 305213231 is 132312503.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 305213231 - 2²⁶ = 238104367 is a prime.

It is a super-2 number, since 2×305213231² = 186310232754918722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (305213201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 152606615 + 152606616.

It is an arithmetic number, because the mean of its divisors is an integer number (152606616).

Almost surely, 2^305213231 is an apocalyptic number.

305213231 is a deficient number, since it is larger than the sum of its proper divisors (1).

305213231 is an equidigital number, since it uses as much as digits as its factorization.

305213231 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 540, while the sum is 20.

The square root of 305213231 is about 17470.3529157255. The cubic root of 305213231 is about 673.2883793197.

Adding to 305213231 its reverse (132312503), we get a palindrome (437525734).

The spelling of 305213231 in words is "three hundred five million, two hundred thirteen thousand, two hundred thirty-one".