305231 has 2 divisors, whose sum is σ = 305232. Its totient is φ = 305230.

The previous prime is 305219. The next prime is 305237. The reversal of 305231 is 132503.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-305231 is a prime.

It is a super-2 number, since 2×305231² = 186331926722, which contains 22 as substring.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (305237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 152615 + 152616.

It is an arithmetic number, because the mean of its divisors is an integer number (152616).

2³⁰⁵²³¹ is an apocalyptic number.

305231 is a deficient number, since it is larger than the sum of its proper divisors (1).

305231 is an equidigital number, since it uses as much as digits as its factorization.

305231 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 90, while the sum is 14.

The square root of 305231 is about 552.4771488487. The cubic root of 305231 is about 67.3301444971.

Adding to 305231 its reverse (132503), we get a palindrome (437734).

The spelling of 305231 in words is "three hundred five thousand, two hundred thirty-one".