231312247 has 2 divisors, whose sum is σ = 231312248. Its totient is φ = 231312246.

The previous prime is 231312233. The next prime is 231312259. The reversal of 231312247 is 742213132.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231312247 is a prime.

It is a super-2 number, since 2×231312247² = 107010711224378018, which contains 22 as substring.

It is equal to p_12710815 and since 231312247 and 12710815 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231312647) 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, 115656123 + 115656124.

It is an arithmetic number, because the mean of its divisors is an integer number (115656124).

Almost surely, 2^231312247 is an apocalyptic number.

231312247 is a deficient number, since it is larger than the sum of its proper divisors (1).

231312247 is an equidigital number, since it uses as much as digits as its factorization.

231312247 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2016, while the sum is 25.

The square root of 231312247 is about 15208.9528567880. The cubic root of 231312247 is about 613.8555816552.

Adding to 231312247 its reverse (742213132), we get a palindrome (973525379).

The spelling of 231312247 in words is "two hundred thirty-one million, three hundred twelve thousand, two hundred forty-seven".