331025231 has 2 divisors, whose sum is σ = 331025232. Its totient is φ = 331025230.

The previous prime is 331025209. The next prime is 331025287. The reversal of 331025231 is 132520133.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-331025231 is a prime.

It is a super-2 number, since 2×331025231² = 219155407117206722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (331025731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165512615 + 165512616.

It is an arithmetic number, because the mean of its divisors is an integer number (165512616).

Almost surely, 2^331025231 is an apocalyptic number.

331025231 is a deficient number, since it is larger than the sum of its proper divisors (1).

331025231 is an equidigital number, since it uses as much as digits as its factorization.

331025231 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 331025231 is about 18194.0987960382. The cubic root of 331025231 is about 691.7572175315.

Adding to 331025231 its reverse (132520133), we get a palindrome (463545364).

The spelling of 331025231 in words is "three hundred thirty-one million, twenty-five thousand, two hundred thirty-one".