231217913 has 2 divisors, whose sum is σ = 231217914. Its totient is φ = 231217912.

The previous prime is 231217879. The next prime is 231217927. The reversal of 231217913 is 319712132.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 191628649 + 39589264 = 13843^2 + 6292^2 .

It is a cyclic number.

It is not a de Polignac number, because 231217913 - 2⁶ = 231217849 is a prime.

It is not a weakly prime, because it can be changed into another prime (231217963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115608956 + 115608957.

It is an arithmetic number, because the mean of its divisors is an integer number (115608957).

Almost surely, 2^231217913 is an apocalyptic number.

It is an amenable number.

231217913 is a deficient number, since it is larger than the sum of its proper divisors (1).

231217913 is an equidigital number, since it uses as much as digits as its factorization.

231217913 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2268, while the sum is 29.

The square root of 231217913 is about 15205.8512750849. The cubic root of 231217913 is about 613.7721225691.

The spelling of 231217913 in words is "two hundred thirty-one million, two hundred seventeen thousand, nine hundred thirteen".