231006331 has 2 divisors, whose sum is σ = 231006332. Its totient is φ = 231006330.

The previous prime is 231006301. The next prime is 231006343. The reversal of 231006331 is 133600132.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 231006331 - 2²⁵ = 197451899 is a prime.

It is a super-2 number, since 2×231006331² = 106727849924163122, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 231006299 and 231006308.

It is not a weakly prime, because it can be changed into another prime (231006301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115503165 + 115503166.

It is an arithmetic number, because the mean of its divisors is an integer number (115503166).

Almost surely, 2^231006331 is an apocalyptic number.

231006331 is a deficient number, since it is larger than the sum of its proper divisors (1).

231006331 is an equidigital number, since it uses as much as digits as its factorization.

231006331 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 324, while the sum is 19.

The square root of 231006331 is about 15198.8924267527. The cubic root of 231006331 is about 613.5848493554.

Adding to 231006331 its reverse (133600132), we get a palindrome (364606463).

The spelling of 231006331 in words is "two hundred thirty-one million, six thousand, three hundred thirty-one".