231322313 has 2 divisors, whose sum is σ = 231322314. Its totient is φ = 231322312.

The previous prime is 231322277. The next prime is 231322319. The reversal of 231322313 is 313223132.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 204146944 + 27175369 = 14288^2 + 5213^2 .

It is a cyclic number.

It is not a de Polignac number, because 231322313 - 2⁶ = 231322249 is a prime.

It is equal to p_12711350 and since 231322313 and 12711350 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (231322319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115661156 + 115661157.

It is an arithmetic number, because the mean of its divisors is an integer number (115661157).

Almost surely, 2^231322313 is an apocalyptic number.

It is an amenable number.

231322313 is a deficient number, since it is larger than the sum of its proper divisors (1).

231322313 is an equidigital number, since it uses as much as digits as its factorization.

231322313 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 648, while the sum is 20.

The square root of 231322313 is about 15209.2837766938. The cubic root of 231322313 is about 613.8644858972.

Adding to 231322313 its reverse (313223132), we get a palindrome (544545445).

It can be divided in two parts, 2 and 31322313, that multiplied together give a palindrome (62644626).

The spelling of 231322313 in words is "two hundred thirty-one million, three hundred twenty-two thousand, three hundred thirteen".