231218093 has 2 divisors, whose sum is σ = 231218094. Its totient is φ = 231218092.

The previous prime is 231217993. The next prime is 231218101. The reversal of 231218093 is 390812132.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 198190084 + 33028009 = 14078^2 + 5747^2 .

It is a cyclic number.

It is not a de Polignac number, because 231218093 - 2¹⁰ = 231217069 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231218293) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115609046 + 115609047.

It is an arithmetic number, because the mean of its divisors is an integer number (115609047).

Almost surely, 2^231218093 is an apocalyptic number.

It is an amenable number.

231218093 is a deficient number, since it is larger than the sum of its proper divisors (1).

231218093 is an equidigital number, since it uses as much as digits as its factorization.

231218093 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 231218093 is about 15205.8571938579. The cubic root of 231218093 is about 613.7722818402.

The spelling of 231218093 in words is "two hundred thirty-one million, two hundred eighteen thousand, ninety-three".