231140197 has 2 divisors, whose sum is σ = 231140198. Its totient is φ = 231140196.

The previous prime is 231140183. The next prime is 231140207. The reversal of 231140197 is 791041132.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 204089796 + 27050401 = 14286^2 + 5201^2 .

It is a cyclic number.

It is not a de Polignac number, because 231140197 - 2¹⁹ = 230615909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231140597) 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, 115570098 + 115570099.

It is an arithmetic number, because the mean of its divisors is an integer number (115570099).

Almost surely, 2^231140197 is an apocalyptic number.

It is an amenable number.

231140197 is a deficient number, since it is larger than the sum of its proper divisors (1).

231140197 is an equidigital number, since it uses as much as digits as its factorization.

231140197 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1512, while the sum is 28.

The square root of 231140197 is about 15203.2955966790. The cubic root of 231140197 is about 613.7033486884.

The spelling of 231140197 in words is "two hundred thirty-one million, one hundred forty thousand, one hundred ninety-seven".