231228317 has 2 divisors, whose sum is σ = 231228318. Its totient is φ = 231228316.

The previous prime is 231228313. The next prime is 231228331. The reversal of 231228317 is 713822132.

231228317 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 171845881 + 59382436 = 13109^2 + 7706^2 .

It is a cyclic number.

It is not a de Polignac number, because 231228317 - 2² = 231228313 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 231228317.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231228313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115614158 + 115614159.

It is an arithmetic number, because the mean of its divisors is an integer number (115614159).

Almost surely, 2^231228317 is an apocalyptic number.

It is an amenable number.

231228317 is a deficient number, since it is larger than the sum of its proper divisors (1).

231228317 is an equidigital number, since it uses as much as digits as its factorization.

231228317 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4032, while the sum is 29.

The square root of 231228317 is about 15206.1933763845. The cubic root of 231228317 is about 613.7813282997.

The spelling of 231228317 in words is "two hundred thirty-one million, two hundred twenty-eight thousand, three hundred seventeen".